Receivables [Abstract] Summary of Receivables from and Payables to Brokerage Clients Schedule of Due to (from) Brokerage Clients [Table Text Block] Tabular disclosure of amounts receivable from and payable to brokerage clients. Accounting Policies [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Furniture and equipment [Member] Furniture and Fixtures [Member] Buildings [Member] Building [Member] Software [Member] Software and Software Development Costs [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2014-09 [Member] Accounting Standards Update 2014-09 [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Summary of Significant Accounting Policies [Line Items] Property, Plant and Equipment [Line Items] Estimated useful life, property, plant and equipment Property, Plant and Equipment, Useful Life Estimated useful life, Software and certain costs incurred for purchasing or developing software Finite-Lived Intangible Asset, Useful Life Income tax benefit Income Tax Expense (Benefit) Capitalized costs Capitalized Contract Cost, Gross Deferred tax liability Deferred Tax Liabilities, Net Retirement Benefits [Abstract] Employee Incentive, Retirement, Deferred Compensation, and Career Achievement Plans Compensation and Employee Benefit Plans [Text Block] Subsequent Events [Abstract] Subsequent Event Subsequent Events [Text Block] Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Income Statement [Table] Condensed Income Statement [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Parent Company [Member] Parent Company [Member] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Interest revenue Interest Income, Operating Interest expense Interest Expense Net interest revenue Interest Income (Expense), Net Other Other Income Expenses excluding interest Noninterest Expense Loss before income tax benefit and equity in net income of subsidiaries Income Loss From Continuing Operations Before Income Taxes And Equity In Earnings Of Subsidiaries Income (Loss) From Continuing Operations before Income Taxes And Equity In Earnings Of Subsidiaries Loss before equity in net income of subsidiaries Income Loss From Continuing Operations Before Equity In Earnings Of Subsidiaries Income (Loss) From Continuing Operations before Equity in Earnings of Subsidiaries Equity in net income of subsidiaries: Income (Loss) from Equity Method Investments, Net of Dividends or Distributions [Abstract] Equity in undistributed net income of subsidiaries Income (Loss) from Equity in Undistributed Net Income of Subsidiaries Income (Loss) from Equity in Undistributed Net Income of Subsidiaries Dividends from bank subsidiary Dividends Received By Parent Company From Bank Subsidiaries Dividends received by parent company from bank subsidiary. Dividends from non-bank subsidiaries Dividends Received By Parent Company From Non Banking Subsidiaries Dividends received by Parent Company from non-banking subsidiaries. Net Income Net Income (Loss) Attributable to Parent Preferred stock dividends and other Preferred Stock Dividends and Other Adjustments Net Income Available to Common Stockholders Net Income (Loss) Available to Common Stockholders, Basic Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] First Mortgage [Member] First Mortgage [Member] HELOC's [Member] Home Equity Line of Credit [Member] Other [Member] Other Loans [Member] Other Loans [Member] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Allowance for Loan and Lease Losses [Roll Forward] Allowance for Loan and Lease Losses [Roll Forward] Balance at beginning of year Loans and Leases Receivable, Allowance Charge-offs Allowance for Loan and Lease Losses, Write-offs Recoveries Valuation Allowances and Reserves, Additions for Recoveries Provision for loan losses Provision for Loan and Lease Losses Balance at end of year Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Pledged asset lines [Member] Pledged Asset Lines [Member] Pledged Asset Lines [Member] Loan to Value [Axis] Loan to Value [Axis] Loan to Value [Domain] Loan to Value [Domain] Estimated Current LTV 70% And Below [Member] Estimated Current Loan To Value Ratio Seventy Percent And Below [Member] Estimated Current Loan to Value Ratio Seventy Percent and Below [Member] Estimated Current LTV Greater Than 70% through 90% [Member] Estimated Current Loan To Value Ratio Greater Than Seventy Percent Through Ninety Percent [Member] Estimated Current Loan To Value Ratio Greater Than Seventy Percent Through Ninety Percent [Member] Estimated Current LTV Greater Than 90% through 100% [Member] Estimated Current Loan To Value Ratio Greater Than Ninety Percent Through One Hundred Percent [Member] Estimated Current Loan To Value Ratio Greater Than Ninety Percent Through One Hundred Percent [Member] Estimated Current LTV Greater Than 100% [Member] Estimated Current Loan To Value Ratio Greater Than One Hundred Percent [Member] Estimated Current Loan To Value Ratio Greater Than One Hundred Percent [Member] Weighted Average Loan to Value Ratio =70% [Member] Weighted Average Loan To Value Ratio Equal To Seventy Percent [Member] Weighted Average Loan to Value Ratio Equal to Seventy Percent [Member] Origination Loan To Value Ratio 70% And Below [Member] Origination Loan To Value Ratio Seventy Percent And Below [Member] Origination Loan To Value Ratio 70 Percent And Below [Member] Origination Loan to Value Ratio Greater Than 70% Through 90% [Member] Origination Loan To Value Ratio Greater Than Seventy Percent Through Ninety Percent [Member] Origination Loan To Value Ratio Greater Than Seventy Percent Through Ninety Percent [Member] Origination Loan to Value Ratio Greater Than 90% Through 100% [Member] Origination Loan To Value Ratio Greater Than Ninety Percent Through One Hundred Percent [Member] Origination Loan to Value Ratio Greater Than Ninety Percent Through One Hundred Percent [Member] Credit Rating Source [Axis] Credit Rating Source [Axis] Credit Rating Source [Domain] Credit Rating Source [Domain] Year of origination Pre 2013 [Member] Year Of Origination One [Member] Year of Origination, One [Member] Year of origination 2013 [Member] Year Of Origination Two [Member] Year of Origination, Two [Member] Year of origination 2014 [Member] Year Of Origination Three [Member] Year of Origination, Three [Member] Year of origination 2015 [Member] Year Of Origination Four [Member] Year of Origination, Four [Member] Year of origination 2016 [Member] Year Of Origination Five [Member] Year of Origination, Five [Member] Year of origination 2017 [Member] Year Of Origination Six [Member] Year of Origination, Six [Member] Credit Score, FICO [Axis] Credit Score, FICO [Axis] Credit Score, FICO [Domain] Credit Score, FICO [Domain] Origination FICO Score Below 620 [Member] Origination Fico Score Below Six Hundred Twenty [Member] Origination FICO Score Below 620 [Member] Origination FICO Score 620 Through 679 [Member] Origination Fico Score Six Hundred Twenty Through Six Hundred Seventy Nine [Member] Origination FICO Score 620 Through 679 [Member] Origination FICO Score 680 Through 739 [Member] Origination Fico Score Six Hundred Eighty Through Seven Hundred Thirty Nine [Member] Origination FICO Score 680 Through 739 [Member] Origination FICO Score 740 And Above [Member] Origination Fico Score Seven Hundred Forty And Above [Member] Origination FICO Score 740 And Above [Member] Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Balance Loans and Leases Receivable, Gross, Consumer, Real Estate Weighted Average Updated FICO Financing Receivable Credit Quality Weighted Average Credit Ratings Updated Financing Receivable, Credit Quality, Weighted Average Credit Ratings Updated Utilization Rate Financing Receivable Credit Quality Utilization Rate Financing Receivable, Credit Quality, Utilization Rate Percent of Loans that are on Nonaccrual Status Loans and Leases Receivable, Ratio of Nonperforming Loans to All Loans Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes [Member] Senior Notes [Member] Medium-Term Notes [Member] Notes Payable to Banks [Member] Finance lease obligation [Member] Capital Lease Obligations [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior Notes Due March 2018 [Member] Senior Notes Due 2018 [Member] Senior Notes Due 2018 [Member] Senior Notes Due July 2018 [Member] Senior Notes Due July 2018 [Member] Senior Notes Due July 2018 [Member] Senior Notes Due 2020 [Member] Senior Notes Due 2020 [Member] Senior Notes Due 2020 [Member] Senior Notes Due 2022 [Member] Senior Notes Due 2022 [Member] Senior Notes Due 2022 [Member] Senior Notes Due 2023 [Member] Senior Notes Due 2023 [Member] Senior Notes Due 2023 [Member] Senior Notes Due 2025 [Member] Senior Notes Due 2025 [Member] Senior Notes Due 2025 [Member] Senior Notes Due 2026 [Member] Senior Notes Due2026 [Member] Senior Notes Due 2026 [Member] Senior Notes Due 2027 [Member] Senior Notes Due 2027 [Member] Senior Notes Due 2027 [Member] Senior Notes Due 2028 [Member] Senior Notes Due 2028 [Member] Senior Notes Due 2028 [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Fixed Interest Rate Debt Instrument, Interest Rate, Stated Percentage Senior Notes Senior Notes Medium Term Notes Medium-term Notes Finance lease obligation Capital Lease Obligations Unamortized discount, net Debt Instrument, Unamortized Discount Debt issuance costs Debt Issuance Costs, Net Total long-term debt Long-term Debt and Capital Lease Obligations Lease term Capital Lease Obligations, Term Capital Lease Obligations, Term Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Net benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Property, Plant and Equipment [Abstract] Equipment, Office Facilities, and Property Property, Plant and Equipment Disclosure [Text Block] Variable Interest Entities [Abstract] Variable Interest Entity Disclosure [Abstract] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Stockholders' Equity Note [Abstract] Preferred Stock Issued and Outstanding Schedule of Stock by Class [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Stock option [Member] Employee Stock Option [Member] Restricted stock unit [Member] Restricted Stock Units (RSUs) [Member] Employee stock purchase plan [Member] Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Total share-based compensation expense Share-based Compensation Income tax benefit on share-based compensation expense Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Leasehold improvements [Member] Leasehold Improvements [Member] Information technology equipment [Member] Technology Equipment [Member] Land [Member] Land [Member] Construction in progress [Member] Construction in Progress [Member] Telecommunications equipment [Member] Other Machinery and Equipment [Member] Property, Plant and Equipment [Line Items] Total equipment, office facilities, and property Property, Plant and Equipment, Gross Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total equipment, office facilities, and property — net Property, Plant and Equipment, Net Investments, Debt and Equity Securities [Abstract] Proceeds Proceeds from Sale of Available-for-sale Securities Gross realized gains Available-for-sale Securities, Gross Realized Gains Gross realized losses Available-for-sale Securities, Gross Realized Losses Other Securities Owned [Abstract] Other Securities Owned [Abstract] Other Securities Owned Other Securities Owned [Text Block] The entire disclosure of Other Securities Owned recorded at fair value. Number of Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding Beginning Balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding Ending Balance (in shares) Weighted- Average Grant Date Fair Value per Unit Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Outstanding Beginning Balance (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding Ending Balance (USD per share) Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets and Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Banking and Thrift [Abstract] Regulatory Capital and Ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Net Capital and Net Capital Requirements for CS&Co Computation of Net Capital under Securities and Exchange Commission Regulation [Table Text Block] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Other Assets Other Assets Disclosure [Text Block] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] U.S. agency mortgage-backed securities [Member] Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Non-agency commercial mortgage-backed securities [Member] Commercial Mortage Backed Securities Issued By Private Enterprises [Member] Commercial Mortage Backed Securities Issued by Private Enterprises [Member] Asset-backed securities [Member] Asset-backed Securities [Member] Corporate debt securities [Member] Corporate Debt Securities [Member] U.S. Treasury securities [Member] US Treasury Securities [Member] Certificates of deposit [Member] Certificates of Deposit [Member] U.S. agency notes [Member] US Government Agencies Debt Securities [Member] Foreign government agency securities [Member] Foreign Government Debt Securities [Member] U.S. state and municipal securities [Member] US States and Political Subdivisions Debt Securities [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Available for sale securities: Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Less than 12 months Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 months Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or longer Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 months or longer Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Total Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Held to maturity securities: Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] Less than 12 months Fair Value Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 months Unrealized Losses Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or longer Fair Value Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 months or longer Unrealized Losses Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Fair Value Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value Total Unrealized Losses Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss Total securities with unrealized losses Continuous Unrealized Loss Position [Abstract] Continuous Unrealized Loss Position [Abstract] Less than 12 months Fair Value Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value This item represents the fair value of securities that have been in a continuous unrealized loss position for less than twelve months. Less than 12 months Unrealized Losses Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Loss Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Aggregate Loss 12 months or longer Fair Value Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value This item represents the fair value of securities that have been in a continuous unrealized loss position for twelve months or longer. 12 months or longer Unrealized Losses Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Loss Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Aggregate Loss Total Fair Value Securities With Unrealized Losses Total Fair Value This item represents the total fair value of securities in an unrealized loss position. Total Unrealized Losses Securities With Unrealized Losses Total Unrealized Loss Securities with Unrealized Losses Total Unrealized Loss Number of available for sale securities in unrealized loss positions Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Number of held to maturity securities in unrealized loss positions Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Accounts receivable Accounts Receivable, Net Interest and dividends receivable Accrued Investment Income Receivable FHLB stock Federal Home Loan Bank Stock Other investments Other Investments Prepaid expenses Prepaid Expense Deferred tax asset — net Deferred Tax Assets, Net Other Other Assets, Miscellaneous Total other assets Other Assets Statement of Financial Position [Abstract] Assets Assets [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash and investments segregated and on deposit for regulatory purposes (including resale agreements of $6,596 and $9,547 at December 31, 2017 and 2016, respectively) Cash and Securities Segregated under Federal and Other Regulations Receivables from brokers, dealers, and clearing organizations Receivables from Brokers-Dealers and Clearing Organizations Receivables from brokerage clients — net Receivables from Customers Other securities owned — at fair value Financial Instruments, Owned, at Fair Value Available for sale securities Available-for-sale Securities, Debt Securities Held to maturity securities (fair value — $120,373 and $74,444 at December 31, 2017 and 2016, respectively) Held-to-maturity Securities Bank loans — net Loans and Leases Receivable, Net Amount Equipment, office facilities, and property — net Goodwill Goodwill Intangible assets — net Intangible Assets, Net (Excluding Goodwill) Other assets Total assets Assets Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Bank deposits Deposits Payables to brokers, dealers, and clearing organizations Payables to Broker-Dealers and Clearing Organizations Payables to brokerage clients Payables to Customers Accrued expenses and other liabilities Accrued Liabilities Short-term borrowings Short-term Debt Long-term debt Total liabilities Liabilities Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock — $.01 par value per share; aggregate liquidation preference of $2,850 and $2,835 at December 31, 2017 and 2016, respectively Preferred Stock, Value, Issued Common stock — 3 billion shares authorized; $.01 par value per share; 1,487,543,446 shares issued Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Treasury stock, at cost — 142,210,890 and 154,793,560 shares at December 31, 2017 and 2016, respectively Treasury Stock, Value Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Home Equity Loans and Lines of Credit, Pledged Asset Lines and Other Lines of Credit [Member] Home Equity Loans And Lines Of Credit Pledged Asset Lines And Other Lines Of Credit [Member] Home Equity Loans and Lines of Credit, Pledged Asset Lines and Other Lines of Credit [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Commitments to extend credit related to unused HELOCs, PALs, and other lines of credit Unused Commitments to Extend Credit Commitments to purchase Loans and Leases Receivable, Commitments to Purchase or Sell Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] First Mortgage And Home Equity [Member] First Mortgage And Home Equity [Member] First Mortgage And Home Equity [Member] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] 30-59 Days Past Due [Member] Financing Receivables, 30 to 59 Days Past Due [Member] 60-89 Days Past Due [Member] Financing Receivables, 60 to 89 Days Past Due [Member] >90 Days Past Due And Other Nonaccrual Loans [Member] Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] California [Member] CALIFORNIA Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Loans Geographic Area [Member] Loans Geographic Area [Member] Loans, Geographic Area [Member] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Current Financing Receivable, Recorded Investment, Current Past due and other nonaccrual loans Financing Receivable, Recorded Investment, Past Due Total loans Allowance for loan losses Total bank loans - net Unamortized premiums and discounts and direct origination costs Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Concentration risk percentage Concentration Risk, Percentage Loans accruing interest contractually 90 days or more past due Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Offsetting [Abstract] Schedule of Fair Value, Off-balance Sheet Risks [Table] Schedule of Fair Value, Off-balance Sheet Risks [Table] Securities Financing Transaction [Axis] Securities Financing Transaction [Axis] Securities Financing Transaction [Domain] Securities Financing Transaction [Domain] Securities Financing Transaction, Fair Value [Member] Securities Financing Transaction, Fair Value [Member] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair value of securities borrowed Fair Value Of Securities Borrowed Fair value of securities borrowed. Quarterly Financial Information Disclosure [Abstract] Total Net Revenues Revenues Total Expenses Excluding Interest Net Income Net Income Available to Common Stockholders Weighted Average Common Shares Outstanding - Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted Average Common Shares Outstanding - Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Basic (USD per share) Earnings Per Share, Basic Diluted (USD per share) Earnings Per Share, Diluted Dividends Declared Per Common Share (USD per share) Common Stock, Dividends, Per Share, Declared Range of Common Stock Price Per Share: Stock Price During Period [Abstract] Stock Price During Period [Abstract] High (USD per share) Stock Price Upper Limit During Period Stock Price Upper Limit During Period Low (USD per share) Stock Price Lower Limit During Period Stock Price Lower Limit During Period Range of Price/Earnings Ratio: Price To Earnings Ratio [Abstract] Price To Earnings Ratio [Abstract] High Price To Earnings Ratio Upper Limit Price To Earnings, Ratio Upper Limit Low Price To Earnings Ratio Lower Limit Price To Earnings, Ratio Lower Limit Net capital Net Capital Minimum net capital required Minimum Net Capital Required 2% of Aggregate Debit Balances Two Percent of Debit Items Net capital in excess of required net capital Alternative Excess Net Capital Home Equity Secured By Second Liens [Member] Home Equity Secured By Second Liens [Member] Home Equity Secured By Second Liens [Member] First Mortgage and Home Equity Loans and Lines of Credit [Member] Adjustable Rate First Mortgage [Member] Adjustable Rate First Mortgage [Member] Adjustable Rate First Mortgage [Member] Loans pledged as collateral Loans Pledged as Collateral Carrying amount of mortgages Mortgage Loans on Real Estate, Carrying Amount of Mortgages Fixed rate interest rate period Mortgage Loans on Real Estate, Fixed Rate Interest Rate Period Mortgage Loans on Real Estate, Fixed Rate Interest Rate Period Percent of loans with interest-only payments Mortgage Loans on Real Estate, Percent of Loans with Interest-Only Payments Mortgage Loans on Real Estate, Percent of Loans with Interest-Only Payments Percent of interest only adjustable rate Mortgage Loans on Real Estate, Percent of Interest Only Adjustable Rate Mortgage Loans on Real Estate, Percent of Interest Only Adjustable Rate Interest-only reset period Mortgage Loans on Real Estate, Interest-Only Reset Period Mortgage Loans on Real Estate, Interest-Only Reset Period Financing Receivable, Loan Term Financing Receivable, Loan Term Financing Receivable, Loan Term Financing Receivable, Initial Draw Period Financing Receivable, Initial Draw Period Financing Receivable, Initial Draw Period Financing Receivable, Convert to Amortizing Loans, Period Financing Receivable, Convert to Amortizing Loans, Period Financing Receivable, Convert to Amortizing Loans, Period Percent of loan balance outstanding, borrowers paid only minimum interest due Financing Receivable, Percent of Loan Balance Outstanding, Borrowers Paid Only Minimum Interest Due Financing Receivable, Percent of Loan Balance Outstanding, Borrowers Paid Only Minimum Interest Due Organization, Consolidation and Presentation of Financial Statements [Abstract] Introduction and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Stock option plan [Member] Stock Option Plan [Member] Stock option plan [Member] Performance Shares [Member] Performance Shares [Member] Shares of common stock authorized to be granted under the existing stock incentive plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Shares reserved for future issuance under the ESPP (in shares) Common Stock, Capital Shares Reserved for Future Issuance Total unrecognized compensation cost, net of forfeitures, related to outstanding stock options, restricted stock awards, and restricted stock units Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Remaining weighted-average period for unrecognized compensation cost, net of forfeitures, related to outstanding stock options, restricted stock awards, and restricted stock units Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Period from the date of grant in which stock options expire Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Total fair value of restricted stock awards vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Components of Other Assets Schedule of Other Assets [Table Text Block] Commercial paper [Member] Commercial Paper [Member] Available for sale securities, fair value Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract] Within 1 year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value After 1 year through 5 years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value After 5 years through 10 years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value After 10 years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Fair Value Available for sale securities, amortized cost Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Within 1 year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis After 1 year through 5 years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis After 5 years through 10 years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis After 10 years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis Weighted-average yield Available-for-sale Securities, Debt Maturities, Weighted Average Yield [Abstract] Available-for-sale Securities, Debt Maturities, Weighted Average Yield [Abstract] Within 1 year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Weighted Average Yield Available-for-sale Securities, Debt Maturities, Next Twelve Months, Weighted Average Yield After 1 year through 5 years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Weighted Average Yield Available-for-sale Securities, Debt Maturities, Year Two Through Five, Weighted Average Yield After 5 years through 10 years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Weighted Average Yield Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Weighted Average Yield After 10 years Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Yield Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Yield Total Available-for-sale Securities, Debt Securities, Weighted Average Yield Available-for-sale Securities, Debt Securities, Weighted Average Yield Held to maturity securities, fair value Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract] Within 1 year Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value After 1 year through 5 years Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value After 5 years through 10 years Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value After 10 years Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value Fair Value Held-to-maturity Securities, Fair Value Held to maturity securities, amortized cost Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Within 1 year Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount After 1 year through 5 years Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount After 5 years through 10 years Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount After 10 years Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount Amortized Cost Weighted-average yield Held-to-maturity Securities, Debt Maturities, Weighted Average Yield [Abstract] Held-to-maturity Securities, Debt Maturities, Weighted Average Yield [Abstract] Within 1 year Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Weighted Average Yield Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Weighted Average Yield After 1 year through 5 years Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Weighted Average Yield Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Weighted Average Yield After 5 years through 10 years Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Weighted Average Yield Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Weighted Average Yield After 10 years Held-to-maturity Securities, Debt Maturities, after Ten Years, Weighted Average Yield Held-to-maturity Securities, Debt Maturities, after Ten Years, Weighted Average Yield Total Held-to-maturity Securities, Weighted Average Yield Held-to-maturity Securities, Weighted Average Yield Income Tax Disclosure [Abstract] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at beginning of year Unrecognized Tax Benefits Additions for tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Additions for tax positions related to prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Reductions for tax positions related to prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Reductions due to lapse of statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Reductions for settlements with tax authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Balance at end of year Weighted-average expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted-average expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Weighted-average risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Deposits from Banking Clients Consisting of Interest Bearing and Noninterest Bearing Deposits Deposits From Banking Clients Table Disclosures [Text Block] This element may be used as a single block of text to encapsulate the deposits from banking clients table. 2018 Purchase Obligation, Due in Next Twelve Months 2019 Purchase Obligation, Due in Second Year 2020 Purchase Obligation, Due in Third Year 2021 Purchase Obligation, Due in Fourth Year 2022 Purchase Obligation, Due in Fifth Year Thereafter Purchase Obligation, Due after Fifth Year Total Purchase Obligation Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Bank Deposits Deposit Liabilities Disclosures [Text Block] Interest-bearing deposits: Interest-bearing Deposit Liabilities [Abstract] Deposits swept from brokerage accounts Brokerage Account Sweep Deposits The amount of interest-bearing deposits swept from brokerage accounts. Checking Demand Deposit Accounts Savings and other Savings And Other Savings and Other Total interest-bearing deposits Interest-bearing Deposit Liabilities Non-interest-bearing deposits Noninterest-bearing Deposit Liabilities Total bank deposits Line of Credit Facility [Table] Line of Credit Facility [Table] Federal Home Loan Bank Advances [Member] Federal Home Loan Bank Advances [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Secured Credit Facility [Member] Secured Debt [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Schwab Bank [Member] Charles Schwab Bank [Member] Charles Schwab Bank [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of credit facility, current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Borrowings on line of credit Long-term Line of Credit Statement of Cash Flows [Abstract] Cash Flows from Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Adjustments to reconcile net income to net cash (used for) provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Provision for loan losses Provision for Loan Losses Expensed Share-based compensation Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Provision (Benefit) for deferred income taxes Deferred Income Tax Expense (Benefit) Premium amortization, net, on available for sale and held to maturity securities Accretion (Amortization) of Discounts and Premiums, Investments Other Other Noncash Income (Expense) Net change in: Increase (Decrease) in Operating Capital [Abstract] Cash and investments segregated and on deposit for regulatory purposes Increase (Decrease) in Restricted Investments for Operating Activities Receivables from brokers, dealers, and clearing organizations Increase (Decrease) in Receivables from Brokers-Dealers and Clearing Organizations Receivables from brokerage clients Increase Decrease In Receivables From Brokerage Clients The net change during the reporting period in receivables from brokerage clients. Brokerage client balances include margin loans to clients stated net of allowance for doubtful accounts. Other securities owned Increase (Decrease) in Financial Instruments Used in Operating Activities Other assets Increase (Decrease) in Other Operating Assets Payables to brokers, dealers, and clearing organizations Increase (Decrease) in Payables to Broker-Dealers and Clearing Organizations Payables to brokerage clients Increase (Decrease) in Payables to Customers Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash Flows from Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of available for sale securities Payments to Acquire Available-for-sale Securities Proceeds from sales of available for sale securities Principal payments on available for sale securities Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Purchases of held to maturity securities Payments to Acquire Held-to-maturity Securities Principal payments on held to maturity securities Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Net increase in bank loans Payments for (Proceeds from) Loans and Leases Purchase of equipment, office facilities, and property Payments to Acquire Property, Plant, and Equipment Purchases of Federal Home Loan Bank stock Payments to Acquire Federal Home Loan Bank Stock Proceeds from sales of Federal Home Loan Bank stock Proceeds from Sale of Federal Home Loan Bank Stock Other investing activities Payments for (Proceeds from) Other Investing Activities Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Cash Flows from Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Net change in bank deposits Increase (Decrease) in Deposits Net proceeds from short-term borrowings Proceeds from Short-term Debt Issuance of long-term debt Proceeds from Issuance of Long-term Debt Repayment of long-term debt Repayments of Long-term Debt Net proceeds from preferred stock offerings Proceeds from Issuance of Preferred Stock and Preference Stock Redemption of preferred stock Payments for Repurchase of Preferred Stock and Preference Stock Dividends paid Payments of Dividends Proceeds from stock options exercised and other Proceeds from Stock Options Exercised Other financing activities Proceeds from (Payments for) Other Financing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Increase (Decrease) in Cash and Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents at Beginning of Year Cash and Cash Equivalents at End of Year Supplemental Cash Flow Information Supplemental Cash Flow Information [Abstract] Cash paid during the year for: Cash Paid During Period For [Abstract] Cash Paid During Period For [Abstract] Interest Interest Paid Income taxes Income Taxes Paid Non-cash investing activity: Noncash Investing and Financing Items [Abstract] Securities purchased during the year but settled after year end Transfer to Investments Bank Loans and Related Allowance for Loan Losses Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Earnings Per Share [Abstract] Earnings Per Common Share Earnings Per Share [Text Block] Fair Value Disclosures [Abstract] Fair Values of Assets and Liabilities Fair Value Disclosures [Text Block] Minimum number of domestic branch offices Minimum Number Of Domestic Branch Offices Minimum number of domestic branch offices. States with domestic branch offices Number of States in which Entity Operates Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Preferred stock dividends and other Common stock equivalent shares related to stock incentive plans (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted-average common shares outstanding — diluted (in shares) Basic EPS (USD per share) Diluted EPS (USD per share) Antidilutive stock options and restricted stock units excluded from the calculation of diluted EPS (n shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Composition of Bank Loans and Delinquency Analysis by Loan Segment Schedule Of Bank Loans By Loan Segment And Past Due Financing Receivables [Table Text Block] Tabular disclosure of the composition of the loan portfolio by loan segment of financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on nonaccrual status. Changes in Allowance for Loan Losses Allowance for Credit Losses on Financing Receivables [Table Text Block] Impaired Bank Loan Assets Impaired Financing Receivables [Table Text Block] Credit Quality Indicators of Bank Loan Portfolio Financing Receivable Credit Quality Indicators [Table Text Block] Convert to Amortizing Loans Schedule of Financing Receivable, Convert to Amortizing Loans [Table Text Block] Schedule of Financing Receivable, Convert to Amortizing Loans [Table Text Block] Financial Information for Reportable Segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Fair Value By Fair Value Hierarchy Level [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) [Member] Fair Value, Inputs, Level 2 [Member] Significant Unobservable Inputs (Level 3) [Member] Fair Value, Inputs, Level 3 [Member] Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Money Market Funds [Member] Money Market Funds [Member] US Government Debt Securities [Member] US Government Debt Securities [Member] Equity and bond mutual funds [Member] Equity And Bond Mutual Funds [Member] Equity And Bond Mutual Funds [Member] Schwab Funds money market funds [Member] Schwab Funds Money Market Funds [Member] Schwab Funds Money Market Funds [Member] State and municipal debt obligations [Member] State And Municipal Debt Obligations [Member] State and Municipal Debt Obligations [Member] Equity, U.S. Government and corporate debt, and other securities [Member] Equity United States Government And Corporate Debt And Other Securities [Member] Equity US Government And Corporate Debt And Other Securities [Member] Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Investments segregated and on deposit for regulatory purposes Cash And Securities Segregated Under Federal And Other Regulations Fair Value Disclosure Cash And Securities Segregated Under Federal And Other Regulations, Fair Value Disclosure Other securities owned Total Assets, Fair Value Disclosure Securities Financing Transaction [Table] Securities Financing Transaction [Table] Fulfillment of Requirements with the Options Clearing Corporation [Member] Fulfillment of Requirements with Options Clearing Corporation [Member] Fulfillment of Requirements with Options Clearing Corporation [Member] Fulfillment of Client Short Sales [Member] Fulfillment of Client Short Sales [Member] Fulfillment of Client Short Sales [Member] Securities Lending to Other Broker-Dealers [Member] Securities Lending to Other Broker-Dealers [Member] Securities Lending to Other Broker-Dealers [Member] Fully-Paid Client Securities [Member] Fully Paid Client Securities [Member] Fully Paid Client Securities [Member] Securities Financing Transaction [Line Items] Securities Financing Transaction [Line Items] Fair value of client securities available to be pledged Fair Value of Securities Received as Collateral that Can be Resold or Repledged Fair value of client securities pledged Fair Value of Securities Received as Collateral that Have Been Resold or Repledged Schedule of Held-to-maturity Securities [Table] Schedule of Held-to-maturity Securities [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast [Member] Scenario, Forecast [Member] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] FHLB [Member] Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] Federal Reserve Bank [Member] Federal Reserve Bank Advances [Member] Trust Deposits [Member] Deposits [Member] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Debt securities transferred from AFS to HTM Available-for-sale Securities, Transferred Security, at Carrying Value Available-for-sale Securities, Transferred Security, at Carrying Value Unrealized loss Available for Sale Securities, Transferred Security, Unrealized Gain (Loss) Available for Sale Securities, Transferred Security, Unrealized Gain (Loss) Assets Fair value of pledged securities Available-for-sale Securities Pledged as Collateral Equity [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Net unrealized gain (loss) on available for sale securities [Member] Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Other [Member] Other Accumulated Other Comprehensive Income [Member] Other Accumulated Other Comprehensive Income [Member] Reclassification of Securities Transferred to Held to Maturity [Member] Other Comprehensive Income (Loss) Reclassification of Securities Transferred to Held to Maturity [Member] Other Comprehensive Income (Loss) Reclassifications [Member] Other Reclassifications in Other Revenue Available for Sale Securities [Member] Accumulated Other Comprehensive Income, Other Reclassifications in Other Revenue [Member] Accumulated Other Comprehensive Income, Other Reclassifications in Other Revenue [Member] Reclassification of Securities Transferred from Available for Sale [Member] Other Comprehensive Income (Loss) Reclassification of Securities Transferred From Available for Sale [Member] Other Comprehensive Income (Loss) Reclassification of Securities Transferred From Available for Sale [Member] Amortization of amounts previously recorded upon transfer to held to maturity from available for sale [Member] Accumulated Amortization of Held to Maturity Securities from Available for Sale Attributable to Parent [Member] Accumulated Amortization of Held to Maturity Securities from Available for Sale Attributable to Parent [Member] Accumulated Other Comprehensive Income [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income AOCI Attributable to Parent, Net of Tax [Roll Forward] Beginning Balance Other net changes Other Comprehensive Income (Loss), Net of Tax Ending Balance Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Domain] Nonperforming Financial Instruments [Member] Nonperforming Financial Instruments [Member] Nonaccrual Loans [Member] Nonaccrual Loans [Member] Nonaccrual Loans [Member] Other Real Estate Owned [Member] Other Real Estate Owned [Member] Other Real Estate Owned [Member] Total nonperforming assets Loans and Leases Receivable, Net of Deferred Income Troubled debt restructurings Financing Receivable, Modifications, Post-Modification Recorded Investment Impaired bank loan related assets Impaired Financing Receivable, with Related Allowance, Recorded Investment Assets: Offsetting Derivative Assets [Abstract] Resale agreements Offsetting Securities Purchased under Agreements to Resell [Abstract] Gross Assets Securities Purchased under Agreements to Resell, Gross Gross Amounts Offset in the Consolidated Balance Sheets Derivative Asset, Collateral, Obligation to Return Cash, Offset Net Amounts Presented in the Consolidated Balance Sheets Securities Purchased under Agreements to Resell Counterparty Offsetting Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities Collateral Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Cash Net Amount Securities Purchased under Agreements to Resell, Amount Offset Against Collateral Securities borrowed Offsetting Securities Borrowed [Abstract] Gross Assets Securities Borrowed, Gross Gross Amounts Offset in the Consolidated Balance Sheets Securities Borrowed, Liability Net Amounts Presented in the Consolidated Balance Sheets Securities Borrowed Counterparty Offsetting Securities Borrowed, Collateral, Obligation to Return Securities Collateral Securities Borrowed, Collateral, Obligation to Return Cash Net Amount Securities Borrowed, Amount Offset Against Collateral Total Gross Assets Derivative Asset, Fair Value, Gross Asset Total Assets, Gross Amounts Offset in the Condensed Consolidated Balance Sheets Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Liability Total Assets, Net Amounts Presented in the Condensed Consolidated Balance Sheets Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting Derivative, Collateral, Obligation to Return Securities Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Derivative, Collateral, Obligation to Return Cash Total Assets, Net Amount Derivative Asset, Fair Value, Amount Offset Against Collateral Liabilities: Offsetting Derivative Liabilities [Abstract] Securities loaned Offsetting Securities Loaned [Abstract] Gross Liabilities Securities Loaned, Gross Gross Amounts Offset in the Consolidated Balance Sheets Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned Net Amounts Presented in the Consolidated Balance Sheets Securities Loaned Counterparty Offsetting Securities Loaned, Collateral, Right to Reclaim Securities Collateral Securities Loaned, Collateral, Right to Reclaim Cash Net Amount Securities Loaned, Amount Offset Against Collateral Total Gross Liabilities Derivative Liability, Fair Value, Gross Liability Total Liabilities, Net Amounts Presented in the Consolidated Balance Sheet Derivative Liability Total Liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting Derivative, Collateral, Right to Reclaim Securities Total Liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Derivative, Collateral, Right to Reclaim Cash Total Liabilities, Net Amount Derivative Liability, Fair Value, Amount Offset Against Collateral Offsetting Assets [Table] Offsetting Assets [Table] Resale And Repurchase Agreements [Member] Resale And Repurchase Agreements [Member] Resale And Repurchase Agreements [Member] Offsetting Assets [Line Items] Offsetting Assets [Line Items] Percentage of collateral to related assets Percentage Of Collateral To Related Assets Percentage Of Collateral To Related Assets Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value of Other Financial Instruments Schedule Of Fair Value Assets And Liabilities For Financial Instruments Not Recorded At Fair Value Table [Text Block] Tabular disclosure of assets and liabilities by class that are not recorded at fair value. The disclosures that may be required or desired include: (a) the carrying value and (b) the level within the fair value hierarchy in which the carrying value falls, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. Number of Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Ending balance (in shares) Vested and expected to vest (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Vested and exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Weighted- Average Exercise Price per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Beginning balance (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Expired (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Ending balance (USD per share) Vested and expected to vest (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Vested and exercisable (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Weighted-Average Remaining Contractual Life Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Vested and exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Vested and exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] CSC [Member] Charles Schwab Corporation [Member] Charles Schwab Corporation [Member] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Common Equity Tier 1 Risk-Based Capital Common Equity Tier One Risk-Based Capital [Abstract] Common Equity Tier One Risk-Based Capital [Abstract] Actual Amount Common Equity Tier One Risk-Based Capital Common Equity Tier 1 Risk Based Capital as defined in the regulations. Actual Ratio Common Equity Tier One Risk Based Capital to Risk Weighted Assets Common Equity Tier 1 capital divided by risk weighted assets as defined by regulations. Minimum to be Well Capitalized Common Equity Tier One Risk Based Capital Required to be Well Capitalized The amount of Common Equity Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. Minimum to be Well Capitalized Ratio Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets The Common Equity Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. Minimum Capital Requirement Common Equity Tier One Risk Based Capital Required for Capital Adequacy The minimum amount of Common Equity Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. Minimum Capital Requirement Ratio Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets The minimum Common Equity Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. Tier 1 Risk-Based Capital Tier One Risk Based Capital [Abstract] Actual Amount Tier One Risk Based Capital Actual Ratio Tier One Risk Based Capital to Risk Weighted Assets Minimum to be Well Capitalized Amount Tier One Risk Based Capital Required to be Well Capitalized Minimum to be Well Capitalized Ratio Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Minimum Capital Requirement Amount Tier One Risk Based Capital Required for Capital Adequacy Minimum Capital Requirement Ratio Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Total Risk-Based Capital Capital [Abstract] Actual Amount Capital Actual Ratio Capital to Risk Weighted Assets Minimum to be Well Capitalized Amount Capital Required to be Well Capitalized Minimum to be Well Capitalized Ratio Capital Required to be Well Capitalized to Risk Weighted Assets Minimum Capital Requirement Amount Capital Required for Capital Adequacy Minimum Capital Requirement Ratio Capital Required for Capital Adequacy to Risk Weighted Assets Tier 1 Leverage Tier One Leverage Capital [Abstract] Actual Amount Tier One Leverage Capital Actual Ratio Tier One Leverage Capital to Average Assets Minimum to be Well Capitalized Amount Tier One Leverage Capital Required to be Well Capitalized Minimum to be Well Capitalized Ratio Tier One Leverage Capital Required to be Well Capitalized to Average Assets Minimum Capital Requirement Amount Tier One Leverage Capital Required for Capital Adequacy Minimum Capital Requirement Ratio Tier One Leverage Capital Required for Capital Adequacy to Average Assets Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Not Primary Beneficiary [Member] Variable Interest Entity, Not Primary Beneficiary [Member] Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] LIHTC Investments [Member] Low Income Housing Tax Credit Investments [Member] Low-Income Housing Tax Credit Investments [Member] Other CRA Investments [Member] Other Community Reinvestment Act Investments [Member] Other Community Reinvestment Act Investments [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Aggregate assets Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets Aggregate liabilities Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Condensed Statements of Income Condensed Income Statement [Table Text Block] Condensed Balance Sheets Condensed Balance Sheet [Table Text Block] Condensed Statements of Cash Flows Condensed Cash Flow Statement [Table Text Block] Financial Instruments Subject to Off-Balance Sheet Credit Risk Financial Instruments Subject To Off Balance Sheet Risk [Text Block] Disclosure of Financial Instruments Subject to Off-Balance Sheet Risk, Credit Risk, or Market Risk Federal Family Education Loan Program Asset-Backed Securities [Member] Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] Collateralized Credit Card Securities [Member] Collateralized Credit Card Securities [Member] Corporate Debt Securities, Information Technology [Member] Corporate Debt Securities, Information Technology [Member] Corporate Debt Securities, Information Technology [Member] Available for sale securities: Available-for-sale Securities [Abstract] Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Held to maturity securities: Held-to-maturity Securities [Abstract] Gross Unrealized Gains Held-to-maturity Securities, Accumulated Unrecognized Holding Gain Gross Unrealized Losses Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Fair Value Asset-backed securities percent Concentration Risk, Asset-Backed Securities Concentration Risk, Asset-Backed Securities Available for sale and held to maturity securities Concentration Risk, Available For Sale And Held To Maturity Securities Concentration Risk, Available For Sale And Held To Maturity Securities Summary of Other Securities Owned Other Securities Owned Table [Text Block] Tabular disclosure of Other Securities Owned recorded at fair value Long-term Debt Including Unamortized Debt Discounts and Premiums Schedule of Debt [Table Text Block] Annual Maturities on Long-term Debt Outstanding Schedule of Maturities of Long-term Debt [Table Text Block] Investment Securities Securities Available For Sale And Held To Maturity [Text Block] This item represents the entire disclosure related to Available-for-sale and Held to Maturity Securities which consist of all investments in certain debt and equity securities not classified as trading. Held to Maturity Securities are investments in certain debt and equity securities for which the Company has the positive intent and ability to hold until maturity. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. Interest revenue Revenue Recognition, Interest [Policy Text Block] Asset management and administration fees Revenue Recognition, Policy [Policy Text Block] Trading revenue Revenue Recognition, Services, Commissions And Principal Transaction [Policy Text Block] Disclosure of accounting policy for revenue recognition for commissions and principal transaction revenues. Cash and cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash and investments segregated and on deposit for regulatory purposes Cash And Securities Segregated Under Federal And Other Regulations Policy [Text Block] Disclosure of accounting policy for cash and investments segregated and on deposit for regulatory purposes. Receivables from brokerage clients Receivables From Brokerage Clients Policy [Text Block] Disclosure of accounting policy for receivables from brokerage clients. Other securities owned Other Securities Owned Policy [Text Block] Disclosure of accounting policy for other securities owned. Investment Securities Marketable Securities, Policy [Policy Text Block] Securities borrowed and securities loaned Securities Borrowed and Loaned Policy [Policy Text Block] Bank loans and related allowance for loan losses Finance, Loans and Leases Receivable, Policy [Policy Text Block] Nonaccrual, nonperforming and impaired loans Loans and Leases Receivable, Nonaccrual Loan and Lease Status, Policy [Policy Text Block] Loan Charge-Offs Uncollectible Loans Write Offs Policy [Text Block] Uncollectible Loans, Write Offs [Policy Text Block] Equipment, office facilities, and property Property, Plant and Equipment, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Intangible assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Low-Income Housing Tax Credit (LIHTC) Investments Low-Income Housing Tax Credit Investments [Policy Text Block] Disclosure of accounting policy for low-income housing tax credit (LIHTC) investments. Guarantees and indemnifications Guarantees, Indemnifications and Warranties Policies [Policy Text Block] Advertising and market development Advertising Costs, Policy [Policy Text Block] Income taxes Income Tax, Policy [Policy Text Block] Share-based compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Fair values of assets and liabilities Fair Value Measurement, Policy [Policy Text Block] New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Other Securities Owned [Table] Other Securities Owned [Table] Other Securities Owned [Table] Other Securities Owned [Line Items] Other Securities Owned [Line Items] Other Securities Owned [Line Items] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event [Line Items] Subsequent Event [Line Items] Fixed interest rate Principal amount Debt Instrument, Face Amount Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Investor Services [Member] Investor Services [Member] Investor Services [Member] Advisor Services [Member] Advisor Services [Member] Advisor Services [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Net Revenues: Revenues [Abstract] Net interest revenue Asset management and administration fees Fees and Commissions Trading revenue Trading Revenue Amount of commission revenue from buying and selling securities on behalf of customers as wells as the amount of gain (loss) resulting from the difference between the acquisition price and the selling price or fair value of trading assets and trading liabilities, conducted separately from customer trading activities. Includes, but is not limited to, changes in fair value of trading assets and trading liabilities. Provision for loan losses Total net revenues Income before taxes on income Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Capital expenditures Payments to Acquire Productive Assets 2018 Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months 2019 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two 2020 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three 2021 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four 2022 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five Total maturities Long-term Debt, Gross Unamortized discount, net Debt issuance costs Number of reportable segments Number of Reportable Segments The Charles Schwab Corporation - Parent Company Only Financial Statements Condensed Financial Information of Parent Company Only Disclosure [Text Block] Margin loans, net of allowance for doubtful accounts Margin Loans to Brokerage Clients, Net Margin loans to brokerage clients, net of allowance for doubtful accounts. Other brokerage receivables Other Receivables from Brokerage Clients Other receivables from brokerage clients. Receivables from brokerage clients — net Payables Payables and Accruals [Abstract] Interest-bearing payables Interest-Bearing Payables to Brokerage Clients Interest-bearing payables to brokerage clients. Non-interest-bearing payables Noninterst-Bearing Payables to Brokerage Clients Noninterst-bearing payables to brokerage clients. Payables to brokerage clients Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Geographic Concentration Risk [Member] Geographic Concentration Risk [Member] Contract with Customer [Member] Revenue from Contract with Customer [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Percent of client accounts Weighted-average fair value of options granted per share (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Cash received from options exercised Tax benefit realized on options exercised Deferred Tax Expense from Stock Options Exercised Aggregate intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Cash and investments segregated and on deposit for regulatory purposes, resale agreements Held to maturity securities: Fair Value Preferred stock, par value (USD per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, aggregate liquidation preference Preferred Stock, Liquidation Preference, Value Common stock, shares authorized (shares) Common Stock, Shares Authorized Common stock, par value (USD per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (shares) Common Stock, Shares, Issued Treasury stock, shares (shares) Treasury Stock, Shares Schedule of Commitments to Purchase or Sell Schedule of Loans and Leases Receivable, Commitments to Purchase or Sell [Table Text Block] Schedule of Loans and Leases Receivable, Commitments to Purchase or Sell [Table Text Block] Future Annual Minimum Rental Commitments, Net of Contractual Subleases Lessee, Operating Lease, Disclosure [Table Text Block] Purchase Obligations Long-term Purchase Commitment [Table Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock [Member] Common Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Shares issued (in shares) Stock Issued During Period, Shares, New Issues Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Receivables from and Payables to Brokerage Clients Receivables from and Payables to Brokerage Clients [Text Block] Disclosures relating to receivables from and payables to brokerage clients, including margin loans to clients stated net of allowance for doubtful accounts. Schedule of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Home Equity Line of Credit [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Margin Requirements [Member] Margin Requirements [Member] Margin requirements [Member] Bond Market Fund Litigation [Member] Bond Market Fund Litigation [Member] Bond Market Fund Litigation [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Mortgage Backed Securities [Member] Collateralized Mortgage Backed Securities [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Purchased first mortgages and HELOCs Payments to Acquire Loans and Leases Held-for-investment Rent expense Operating Leases, Rent Expense Aggregate face amount of letter of credit agreements Letter of Credit, Current Borrowing Capacity Letter of Credit, Current Borrowing Capacity Funds drawn under LOC's Long-term Letter of Credit Long-term Letter of Credit Alleged minimum percentage of fund assets invested in CMOs and mortgage-backed securities without obtaining shareholder vote Maximum Amount of Fund Assets Allowable Without Obtaining Fundholder Vote, Percentage Alleged minimum percentage of fund assets invested in CMOs and mortgage-backed securities without obtaining shareholder vote 2018 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Net Carrying Value Finite-Lived Intangible Assets, Net Other comprehensive income (loss) before tax Other Comprehensive Income (Loss), before Tax [Abstract] Net unrealized gain (loss) Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Reclassification of net unrealized loss transferred to held to maturity Other Comprehensive Income (Loss), Reclassification Adjustment From Available-for-sale to Held-To-Maturity, Before Tax Other Comprehensive Income (Loss), Reclassification Adjustment From Available-for-sale to Held-To-Maturity, Before Tax Other reclassifications included in other revenue Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Change in net unrealized gain (loss) on held to maturity securities: Other Comprehensive Loss, Held-to-maturity Security, OTTI, before Tax, after Adjustments, Attributable to Parent [Abstract] Reclassification of net unrealized loss transferred from available for sale Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from Securities Transferred from Available for Sale Before Tax Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from Securities Transferred from Available for Sale, Before Tax Amortization of amounts previously recorded upon transfer from available for sale Other Comprehensive Loss, Held-to-maturity Security, Transferred From Available for Sale, Amortization, Before Tax Other Comprehensive Loss, Held-to-maturity Security, Transferred From Available for Sale, Amortization, Before Tax Other Other Comprehensive Income, Other, Before Tax Other Comprehensive Income, Other, Before Tax Other comprehensive income (loss), before tax Other Comprehensive Income (Loss), before Tax Tax effect Other Comprehensive Income (Loss), Tax [Abstract] Net unrealized gain (loss) Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Reclassification of net unrealized loss on securities transferred to held to maturity Other Comprehensive Income (Loss), Reclassification Adjustment From Available-for-sale to Held-To-Maturity, Tax Other Comprehensive Income (Loss), Reclassification Adjustment From Available-for-sale to Held-To-Maturity, Tax Other reclassifications included in other revenue Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Change in net unrealized gain (loss) on held to maturity securities: Other Comprehensive Loss, Held-to-maturity Security, OTTI, after Adjustments, Tax, Attributable to Parent [Abstract] Reclassification of net unrealized loss on securities transferred from available for sale (1) Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from Securities Transferred from Available for Sale, Tax Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from Securities Transferred from Available for Sale, Tax Amortization of amounts previously recorded upon transfer from available for sale Other Comprehensive Loss, Held-to-maturity Security, Transferred From Available for Sale, Amortization, Tax Other Comprehensive Loss, Held-to-maturity Security, Transferred From Available for Sale, Amortization, Tax Other Other Comprehensive Income, Other, Tax Other Comprehensive Income, Other, Tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Tax Net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Net unrealized gain (loss) Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Reclassification of net unrealized loss on securities transferred to held to maturity Other Comprehensive Income (Loss), Reclassification Adjustment From Available-for-sale to Held-To-Maturity, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment From Available-for-sale to Held-To-Maturity, Net of Tax Other reclassifications included in other revenue Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Change in net unrealized gain (loss) on held to maturity securities: Other Comprehensive Loss, Held-to-maturity Security, OTTI, after Tax and Adjustments, Attributable to Parent [Abstract] Reclassification of net unrealized loss on securities transferred from available for sale Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from Securities Transferred from Available for Sale, Net of Tax Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from Securities Transferred from Available for Sale, Net of Tax Amortization of amounts previously recorded upon transfer from available for sale Other Comprehensive Loss, Held-to-maturity Security, Transferred From Available for Sale, Amortization, Net of Tax Other Comprehensive Loss, Held-to-maturity Security, Transferred From Available for Sale, Amortization, Net of Tax Other Other Comprehensive Income, Other, Net of Tax Other comprehensive income (loss), net of tax Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Available for Sale and Securities Held to Maturity Unrealized Gain (Loss) on Investments [Table Text Block] Securities with Unrealized Losses, Aggregated by Category and Period of Continuous Unrealized Loss Schedule of Unrealized Loss on Investments [Table Text Block] Maturities of Securities Available for Sale and Securities Held to Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Proceeds and Gross Realized Gains And Losses from Sales of Securities Available for Sale Schedule of Realized Gain (Loss) [Table Text Block] Deferred tax assets: Deferred Tax Assets, Gross [Abstract] Employee compensation, severance, and benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Severance Payments Net unrealized loss on available for sale securities Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross Reserves and allowances Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Returns and Allowances Facilities lease commitments Deferred Tax Assets Leasing Arrangements Deferred Tax Assets, Leasing Arrangements State and local taxes Deferred Tax Assets, Operating Loss Carryforwards, State and Local Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Other Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Deferred tax assets — net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Capitalized internal-use software development costs Deferred Tax Liabilities, Deferred Expense, Capitalized Software Depreciation and amortization Deferred Tax Liabilities Depreciation And Amortization Deferred Tax Liabilities, Depreciation and Amortization Other Deferred Tax Liabilities, Deferred Expense, Other Capitalized Costs Total deferred tax liabilities Deferred Tax Liabilities, Gross Deferred tax asset – net Statement of Comprehensive Income [Abstract] Other comprehensive income (loss), before tax: Change in net unrealized gain (loss) on available for sale securities: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] Change in net unrealized gain (loss) on held to maturity securities: Income tax effect Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Components of Other Comprehensive Income (Loss) Comprehensive Income (Loss) [Table Text Block] Accumulated Other Comprehensive Income Balances Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries Due from (to) subsidiaries — net Proceeds From Payments To Consolidated Subsidiary Proceeds From Payments To Consolidated Subsidiary Increase in investments in subsidiaries Payments to Acquire Additional Interest in Subsidiaries Repayments (Advances) of subordinated loan to CS&Co Payments to Fund Long-term Loans to Related Parties Net proceeds from preferred stock offerings Increase (Decrease) in Cash and Cash Equivalents Schedule of Equipment, Office Facilities, and Property Property, Plant and Equipment [Table Text Block] Operating Leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Subleases Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals [Abstract] Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals [Abstract] 2018 Operating Leases Future Minimum Payments Due Current Future Minimum Sublease Rentals Contractually required future rental payments receivable within one year of the balance sheet date on noncancelable subleasing arrangements. 2019 Operating Leases Future Minimum Payments Due In Two Years Future Minimum Sublease Rentals Contractually required future rental payments receivable within the second year of the balance sheet date on noncancelable subleasing arrangements. 2020 Operating Leases Future Minimum Payments Due In Three Years Future Minimum Sublease Rentals Contractually required future rental payments receivable within the third year of the balance sheet date on noncancelable subleasing arrangements. 2021 Operating Leases Future Minimum Payments Due In Four Years Future Minimum Sublease Rentals Contractually required future rental payments receivable within the fourth year of the balance sheet date on noncancelable subleasing arrangements. 2022 Operating Leases Future Minimum Payments Due In Five Years Future Minimum Sublease Rentals Contractually required future rental payments receivable within the fifth year of the balance sheet date on noncancelable subleasing arrangements. Thereafter Operating Leases Future Minimum Payments Due Thereafter Future Minimum Sublease Rentals Contractually required future rental payments receivable after the fifth year from the balance sheet date on noncancelable subleasing arrangements. Total Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals Net Operating Leases Future Minimum Payments Due Net [Abstract] Operating Leases Future Minimum Payments Due Net [Abstract] 2018 Operating Leases Future Minimum Payments Due Current Net For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date relating to leases defined as operating, net of contractual subleases. 2019 Operating Leases Future Minimum Payments Due In Two Years Net For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the second year of the balance sheet date relating to leases defined as operating, net of contractual subleases. 2020 Operating Leases Future Minimum Payments Due In Three Years Net For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the third year of the balance sheet date relating to leases defined as operating, net of contractual subleases. 2021 Operating Leases Future Minimum Payments Due In Four Years Net For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fourth year of the balance sheet date relating to leases defined as operating, net of contractual subleases. 2022 Operating Leases Future Minimum Payments Due In Five Years Net For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fifth year of the balance sheet date relating to leases defined as operating, net of contractual subleases. Thereafter Operating Leases Future Minimum Payments Due Thereafter Net For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due after the fifth year from the balance sheet date on leases defined as operating, net of contractual subleases. Total Operating Leases Future Minimum Payments Due Net The total of future contractually required payments on leases defined as operating, net of contractual subleases. Quarterly Financial Information (Unaudited) Quarterly Financial Information [Text Block] Stock-Based Compensation Expense and Related Income Tax Benefit Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Stock Option Activity Share-based Compensation, Stock Options, Activity [Table Text Block] Information on Stock Options Granted and Exercised Share Based Compensation Stock Options Granted And Exercised Disclosure [Text Block] Share Based Compensation Stock Options Granted And Exercised Disclosure Text Block Assumptions Used to Value Options Granted and Their Expected Lives Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Restricted Stock Units Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Changes in Projected Benefit Obligations Schedule of Changes in Projected Benefit Obligations [Table Text Block] Schedule of Net Benefit Costs and Assumptions Used Schedule Of Net Benefit Costs And Assumptions Used [Table Text Block] Schedule Of Net Benefit Costs And Assumptions Used [Table Text Block] Schedule of Components and Amounts Impacting AOCI Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Offsetting Assets and Liabilities Offsetting Assets and Liabilities [Table Text Block] Offsetting Assets and Liabilities Summary of the Fair Value of Client Securities Available to Utilize as Collateral and Amounts Pledged Schedule of Securities Financing Transactions, Securities Available to Utilize as Collateral and Amounts Pledged [Table Text Block] Schedule of Securities Financing Transactions, Securities Available to Utilize as Collateral and Amounts Pledged [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Reported Value Measurement [Member] Reported Value Measurement [Member] Portion at Other than Fair Value Measurement [Member] Portion at Other than Fair Value Measurement [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash and investments segregated and on deposit for regulatory purposes Receivables from brokers, dealers, and clearing organizations Receivables From Brokers Dealers And Clearing Organizations Fair Value Disclosure Receivables From Brokers Dealers And Clearing Organizations, Fair Value Disclosure Receivables from brokerage clients — net Accounts Receivable, Fair Value Disclosure Bank loans, net Loans Receivable, Fair Value Disclosure Other assets Other Assets, Fair Value Disclosure Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Bank deposits Deposits, Fair Value Disclosure Payables to brokers, dealers, and clearing organizations Payables To Broker Dealers And Clearing Organizations Fair Value Disclosure Payables To Broker Dealers And Clearing Organizations, Fair Value Disclosure Payables to brokerage clients Payables To Customers, Fair Value Disclosure Fair value portion of liabilities incurred for customers payables. Accrued expenses and other liabilities Accrued Liabilities, Fair Value Disclosure Short-term borrowings Short-term Debt, Fair Value Long-term debt Long-term Debt, Fair Value Total Financial Liabilities Fair Value Disclosure Intangible asset, amortization expense Amortization of Intangible Assets Goodwill impairment Goodwill, Impairment Loss Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Receivables from subsidiaries Accounts Receivable, Related Parties Available for sale securities Available-for-sale Securities Held to maturity securities Loans to non-bank subsidiaries Loans To Non Banking Subsidiaries Loans to non-banking subsidiaries. Investment in non-bank subsidiaries Investment In Non Banking Subsidiaries Investment in non-banking subsidiaries. Investment in bank subsidiary Investment In Banking Subsidiaries Investment in banking subsidiaries. Payables to subsidiaries Due to Related Parties Stockholders’ equity CS&Co [Member] Charles Schwab and Co., Inc [Member] Charles Schwab and Co., Inc [Member] Reserve Deposit [Member] Reserve Deposit [Member] Reserve Deposit [Member] Schwab Bank's average reserve requirement Average Reserve Required With Federal Reserve Bank The average reserve the Board of Governors of the Federal Reserve System require Schwab Bank to maintain at the Federal Reserve Bank. Required capital conservation buffer of risk-weighted assets Risk Weighted Assets, Capital Conservation Buffer Required Risk Weighted Assets, Capital Conservation Buffer Required Capital convservation buffer of risk-weighted assets annual increase Risk Weighted Assets, Capital Conservation Buffer Annual Increase Risk Weighted Assets, Capital Conservation Buffer Annual Increase Capital conservation buffer of risk-weighted assets when fully implemented Risk Weighted Assets, Capital Conservation Buffer When Fully Implemented Risk Weighted Assets, Capital Conservation Buffer When Fully Implemented Percentage of aggregate debit balances required as minimum net capital Percentage Of Aggregate Debit Balances Required As Minimum Net Capital Percentage of aggregate debit balances required as minimum net capital Minimum capital requirement Percentage of net capital to aggregate debit balances required for a broker-dealer to repay subordinated borrowings, pay cash dividends, or make any unsecured advances or loans to its parent company or employees Percentage Net Capital To Aggregate Debit Balances Required For Broker Dealer For Certain Payments Percentage of net capital to aggregate debit balances required for a broker-dealer to repay subordinated borrowings, pay cash dividends, or makes any unsecured advances or loans to its parent company or employees. Percentage of net capital to the Company's minimum dollar requirement required for a broker-dealer to repay subordinated borrowings, pay cash dividends, or make any unsecured advances or loans to its parent company or employees Percentage Net Capital To Minimum Dollar Requirement Required For Broker Dealer For Certain Payments Percentage of net capital to the Company's minimum dollar requirement required for a broker-dealer to repay subordinated borrowings, pay cash dividends, or make any unsecured advances or loans to its parent company or employees. Cash and investments required to be segregated and on deposit for regulatory purposes Cash and Securities Segregated under Securities Exchange Commission Regulation Net amount of segregated cash deposited into segregated reserve bank accounts Cash Reserve Deposit Required and Made Commitment, expected payment date Investment, Commitment, Expected Payment Date Investment, Commitment, Expected Payment Date Schedule of estimated useful lives Borrowings Debt Disclosure [Text Block] Accumulated Other Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Preferred Stock [Member] Preferred Stock [Member] Additional Paid-In Capital [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Treasury Stock, at cost [Member] Treasury Stock [Member] Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance Beginning Balance (in shares) Shares, Outstanding Other comprehensive income (loss), net of tax Issuance of preferred stock, net Stock Issued During Period, Value, New Issues Redemption of preferred stock Stock Redeemed or Called During Period, Value Dividends declared on preferred stock Dividends, Preferred Stock, Cash Dividends declared on common stock Dividends, Common Stock, Cash Stock option exercises and other Stock Option Exercises And Other Value Stock Option Exercises And Other Share-based compensation and related tax effects Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Other Stockholders' Equity, Other Ending Balance (in shares) Ending Balance Beginning balance Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Actuarial gain/(loss) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Ending balance Net gain/(loss) Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Amount recognized in AOCI Tax effect Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Tax Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Tax Net amount recognized in AOCI Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Remeasurement of net deferred tax assets Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense Unrecognized tax benefits Unrecognized tax benefits that, if recognized, would affect the annual effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized tax benefits, interest and penalties accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State income taxes, net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Equity compensation benefit Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective income tax rate Effective Income Tax Rate Reconciliation, Percent EPS under Basic and Diluted Computations Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Temporary Differences That Created Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Reconciliation of Federal Statutory Income Tax Rate to Effective Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Converted to amortizing loan by period end Financing Receivable, Amount Converted to Amortizing Loan by Period End Financing Receivable, Amount Converted to Amortizing Loan by Period End Within 1 year Financing Receivable, Converted to Amortizing Loan, Year One Financing Receivable, Converted to Amortizing Loan, Year One 1 year – 3 years Financing Receivable, Converted to Amortizing Loan, Year One to Year Three Financing Receivable, Converted to Amortizing Loan, Year One to Year Three 3 years – 5 years Financing Receivable, Converted to Amortizing Loan, Year Three to Year Five Financing Receivable, Converted to Amortizing Loan, Year Three to Year Five 5 years Financing Receivable, Converted to Amortizing Loan, Year Five Financing Receivable, Converted to Amortizing Loan, Year Five Total Financing Receivable, Converted to Amortizing Loan Financing Receivable, Converted to Amortizing Loan Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Total current Current Income Tax Expense (Benefit) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Total deferred Taxes on income Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Client relationships [Member] Customer Relationships [Member] Technology [Member] Technology-Based Intangible Assets [Member] Trade name [Member] Trade Names [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Gross Carrying Value Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Carrying Value, Including non-amortizing loan Finite-Lived Intangible Assets, Including Non-Amortizing Asset, Net Finite-Lived Intangible Assets, Including Non-Amortizing Asset, Net Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Investment crediting rate for notional account balances Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Investment Crediting Rate For Notional Account Balances Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Investment Crediting Rate For Notional Account Balances Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Projected benefit obligation at beginning of year Defined Benefit Plan, Benefit Obligation Benefit cost Actuarial (gain)/loss Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Projected benefit obligation at the end of year Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Income Statement [Abstract] Other Expenses Excluding Interest Noninterest Expense [Abstract] Compensation and benefits Labor and Related Expense Professional services Professional Fees Occupancy and equipment Occupancy, Net Advertising and market development Marketing and Advertising Expense Communications Communication Regulatory fees and assessments Regulatory Fees And Assessments Regulatory Fees And Assessments Other Other Expenses Total expenses excluding interest Income before taxes on income Taxes on income Weighted-Average Common Shares Outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Diluted (in shares) Earnings Per Common Share: Earnings Per Share, Basic and Diluted [Abstract] Fee waivers Fees and Commissions, Waivers Fees and Commissions, Waivers Series B Preferred Stock [Member] Series B Preferred Stock [Member] Series C Preferred Stock [Member] Series C Preferred Stock [Member] Series D Preferred Stock [Member] Series D Preferred Stock [Member] Series A Preferred Stock [Member] Series A Preferred Stock [Member] Series E Preferred Stock [Member] Series E Preferred Stock [Member] Series F Preferred Stock [Member] Series F Preferred Stock [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR [Member] London Interbank Offered Rate (LIBOR) [Member] Shares issued (in shares) Preferred Stock, Shares Issued Shares outstanding (in shares) Preferred Stock, Shares Outstanding Liquidation preference (USD per share) Preferred Stock, Liquidation Preference Per Share Carrying Value Dividend Rate in Effect Preferred Stock, Dividend Rate, Percentage Floating Annual Rate Preferred Stock Basis Spread On Variable Rate The percentage points added to the reference rate to compute the variable rate. Regulatory Requirements Regulatory Capital Requirements Under Banking And Broker Dealer Regulations [Text Block] The entire disclosure for federal savings banks and broker-dealers, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of the Comptroller of the Currency (OCC), the Securities and Exchange Commission (SEC), and the Commodity Futures Trading Commission (CFTC). Company's total contribution expense Defined Contribution Plan, Cost Deferred compensation liability Deferred Compensation Liability, Current and Noncurrent Depreciation and amortization expense for equipment, office facilities, and property Depreciation Taxes on Income Income Tax Disclosure [Text Block] Aggregate Assets, Liabilities and Maximum Exposure to Loss Schedule of Variable Interest Entities [Table Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Beginning balance Goodwill acquired and other changes during the period Goodwill Acquired And Other Changes During Period The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. Includes other increases or decreases during the reporting period in the carrying value of goodwill that are not separately disclosed. Ending balance Intangible Assets and Goodwill Schedule of Finite-Lived Intangible Assets [Table Text Block] Estimated Future Annual Amortization Expense for Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Changes in Carrying Amount of Goodwill as Allocated to Reportable Segments Schedule of Goodwill [Table Text Block]