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or more Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Deposits [Abstract] Deposits [Abstract] Allowance for Loan Losses [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Obligations to customers Client Funds Held The balance at the reporting period in the carrying amount of client funds held and maintained in custodial and separate accounts, and which are owned by clients or contract holders. Credit Quality Indicator [Axis] Internal Credit Assessment [Axis] Common Stock Other Than Class A Member Common Stock Other Than Class A [Member] Common Stock Other Than Class A Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Fair Value Estimate of Fair Value Measurement [Member] Agency bond securities US Treasury Securities [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Accounts payable Accounts Payable, Current Income Tax Authority [Axis] Income Tax Authority [Axis] Schedule of Past Due Financing Receivables Financing Receivable, Past Due [Table Text Block] Provision for loan losses Provision for Other Credit Losses Loans to bank customers, net of allowance Loans Receivable, Fair Value Disclosure Schedule of Maturity Dates for Available-for-Sale Investment Securities Investments Classified by Contractual Maturity Date [Table Text Block] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Consumer Services Consumer Services Consumer Services [Member] Consumer Services Entity Filer Category Entity Filer Category Basic weighted-average common shares issued and outstanding (in shares) Weighted-average Class A shares issued and outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Loans and Leases Receivable Disclosure [Abstract] Loans and Leases Receivable Disclosure [Abstract] Loss contingency accrual Loss Contingency Accrual Money Movement Services Money Movement Services Money Movement Services [Member] Money Movement Services [Member] Liabilities Liabilities, Fair Value Disclosure [Abstract] Ownership percentage Equity Method Investment, Ownership Percentage Employee stock-based compensation Stock based compensation and related employer taxes Share-Based Payment Arrangement, Expense Commitments and contingencies (Note 17) Commitments and Contingencies Security Exchange Name Security Exchange Name Options outstanding, Beginning balance, Weighted average exercise price (in usd per share) Options outstanding, Ending balance, Weighted average exercise price (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segment Reconciling Items Segment Reconciling Items [Member] Card revenues and other fees Card Revenues And Other Fees [Member] Card Revenues And Other Fees [Member] Financial Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Operating revenues Revenue from Contract with Customer, Excluding Assessed Tax Corporate bonds Corporate bonds Corporate Bond Securities [Member] Income tax receivable/payable Increase (Decrease) in Income Taxes Payable 60-89 Days Past Due Financial Asset, 60 to 89 Days Past Due [Member] Cover page. Cover [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Level 3 Fair Value, Inputs, Level 3 [Member] Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Nondeductible expenses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Reserve for uncollectible overdrawn accounts Balance, beginning of period Balance, end of period Accounts Receivable, Allowance for Credit Loss Revenues Revenue from Contract with Customer [Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Loans to Bank Customers Financing Receivables [Text Block] Interest expense, net Interest Income (Expense), Net Taxes paid related to net share settlement of equity awards Payment, Tax Withholding, Share-Based Payment Arrangement Total liabilities and stockholders’ equity Liabilities and Equity Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Four Lessee, Operating Lease, Liability, to be Paid, after Year Four Facility term Debt Instrument, Term Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Deposits Deposit Liabilities Disclosures [Text Block] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Repayments on revolving line of credit Repayments of Long-Term Lines of Credit Remaining authorized amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Dilutive potential common shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Diluted earnings per Class A common share Earnings Per Share, Diluted [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Total outstanding (as a percent) Financing Receivable, Recorded Investment, Percent Financing Receivable, Recorded Investment, Percent Level 2 Fair Value, Inputs, Level 2 [Member] Current Fiscal Year End Date Current Fiscal Year End Date Income tax penalties and interest accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Savings Deposits, Savings Deposits Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Diluted net income allocated to Class A common stockholders Net Income (Loss) Available to Common Stockholders, Diluted Sale of Stock [Domain] Sale of Stock [Domain] Secured credit card Secured credit card Credit Card Receivable [Member] Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Consolidation Items [Axis] Consolidation Items [Axis] Walmart Walmart [Member] Walmart. Concentration Risk by Type [Axis] Concentration Risk Type [Axis] Total current liabilities Liabilities, Current 2024 Lessee, Operating Lease, Liability, to be Paid, Year Two Residential Residential Residential Portfolio Segment [Member] Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Customer concentration risk Customer Concentration Risk [Member] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-Sale Securities [Table] Unrecognized tax benefits Beginning balance Ending balance Unrecognized Tax Benefits Cash processing revenues Cash Processing Revenues [Member] Cash Processing Revenues Provision for loans Financing Receivable, Credit Loss, Expense (Reversal) Share Repurchase Program [Axis] Share Repurchase Program [Axis] The total amount of unrecognized tax benefits that, 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Facility [Axis] Credit Facility [Axis] Unrealized holding loss, net of tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Total current or less than 30 days past due (as a percent) Financing Receivable, Recorded Investment, Percent Current Financing Receivable, Recorded Investment, Percent Current Equity [Abstract] Equity [Abstract] Entity Tax Identification Number Entity Tax Identification Number Shares outstanding, beginning balance (in shares) Shares outstanding, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Loans charged off Financing Receivable, Allowance for Credit Loss, Writeoff Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Non-Classified Pass [Member] Total Current or Less Than 30 Days Past Due Financial Asset, Not Past Due [Member] Legal settlement expenses Litigation Settlement, Expense Schedule of Reconciliation of Effective Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Net (decrease) increase in unrestricted cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect State income taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Overdrawn cardholder balances from purchase transactions Reserve for Uncollectible Overdrawn Accounts From Purchase Transactions Overdrawn Cardholder Balances From Purchase Transactions [Member] Overdrawn Cardholder Balances From Purchase Transactions Entity Central Index Key Entity Central Index Key Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Single BaaS Partner Single BaaS Partner [Member] Single BaaS Partner Measurement Frequency [Axis] Measurement Frequency [Axis] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Total interest-bearing deposit accounts Interest-Bearing Deposit Liabilities Tax Period [Axis] Tax Period [Axis] Capital contributions, authorized amount Limited Partners' Annual Contributed Capital, Authorized Amount Limited Partners' Annual Contributed Capital, Authorized Amount City Area Code City Area Code Assets Assets [Abstract] Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Sale of Stock [Axis] Sale of Stock [Axis] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Non-interest bearing deposit accounts Noninterest-Bearing Deposit Liabilities Number of shares repurchased (in shares) Accelerated Share Repurchases, Number Of Shares Repurchased Accelerated Share Repurchases, Number Of Shares Repurchased Proceeds from maturities of available-for-sale securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Receivables due from card issuing banks Receivables Due From Card Issuing Banks [Member] Receivables from card issuing banks primarily represent revenue-related funds collected by the card issuing banks from our retail distributors, merchant banks and cardholders that have yet to be remitted to us. These receivables are generally collected within a short period of time based on remittance terms in our agreements with the card issuing banks. Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Federal Funds Rate Base Rate, Condition One [Member] Base Rate, Condition One [Member] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Investment in TailFin Labs, LLC Payments to Acquire Equity Method Investments Investment Held By Bank Investment Held By Bank [Member] Investment Held By Bank Variable Rate [Axis] Variable Rate [Axis] Other accrued liabilities Other Liabilities, Noncurrent Equity Method Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Losses (earnings) in equity method investments Income (loss) in equity method investments Income (Loss) from Equity Method Investments Fair value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Impairment charges Asset Impairment Charges Payments for acquisition of property and equipment Payments to Acquire Property, Plant, and Equipment Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Tax year 2023-2027 Tax Year 2023-2027 [Member] Tax Year 2023-2027 [Member] Consumer Consumer Portfolio Segment [Member] Schedule of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Due in 2025 Time Deposit Maturities, Year Three Customer [Domain] Customer [Domain]