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Instrument, Quarterly Variable Exit Fee Basis, First Principal Balance Repurchased Amount Debt Instrument, Quarterly Variable Exit Fee Basis, First Principal Balance Repurchased Amount Unamortized deferred financing costs Debt Issuance Costs, Net Restricted Stock Units Unvested Restricted Stock Units Unvested [Member] Restricted Stock Units Unvested Derivative, gain (loss) net Derivative, Gain (Loss) on Derivative, Net Class of warrant or right, outstanding, intrinsic value Class Of Warrant Or Right, Outstanding, Intrinsic Value Class Of Warrant Or Right, Outstanding, Intrinsic Value Common stock, shares outstanding (in shares) Common stock, Beginning balance (in shares) Common stock, Ending balance (in shares) Common Stock, Shares, Outstanding Financing Receivable Benchmark Financing Receivable Benchmark [Member] Financing Receivable Benchmark Marketable securities: Marketable Securities [Member] Marketable Securities Gain on sale of loans, net Gain (Loss) on Sales of Loans, Net 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Table [Member] Vesting of preferred stock warrants Adjustments to Additional Paid in Capital, Warrant Issued Servicing Liabilities at Fair Value [Line Items] Servicing Liabilities at Fair Value [Line Items] Total shares authorized (in shares) Total Common Stock And Preferred Stock, Shares Authorized Total Common Stock And Preferred Stock, Shares Authorized FCC Certificates FCC Certificates [Member] FCC Certificates Rate change / state impact Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Proceeds from sale of marketable securities Proceeds from Sale and Maturity of Marketable Securities Debt securities collateralized under repurchase agreements Collateralized Debt Securities Under Repurchase Agreements [Member] Collateralized Debt Securities Under Repurchase Agreements Unrecognized tax benefits Unrecognized tax benefits at beginning of year Unrecognized tax benefits at end of year Unrecognized Tax Benefits Other digital assets Crypto Asset, Other [Member] Solana (SOL) Solana (SOL) [Member] Solana (SOL) Antidilutive securities excluded from computation of earnings per share, amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted-average Class A and Class B common shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Net Proceeds from issuance of preferred stock Proceeds from Issuance of Preferred Stock and Preference Stock Realized losses on futures Payments for Derivative Instrument, Investing Activities Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Schedule of Held-to-Maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] 2027 Long-Term Debt, Maturity, Year Two 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[Member] Change Impact, Plus 2 Percentage Number of shares vested (in shares) Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Digital Asset Collateral Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Net increase in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Combination transferred Other Significant Noncash Transaction, Value of Consideration Given SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Operations and processing Operations And Processing Expense Operations And Processing Expense Statistical Measurement [Domain] Statistical Measurement [Domain] Other current asset: Other Current Assets [Member] Thereafter Lessee, Operating Lease, Liability, to be Paid, after 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Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions RSUs Restricted Stock Units [Abstract] Restricted Stock Units Loans Underlying Servicing Assets Loans Underlying Servicing Assets [Member] Loans Underlying Servicing Assets Digital asset, fair value Crypto Asset, Fair Value, Current Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Warrants (in shares) Outstanding, beginning balance (in shares) Outstanding, ending balance (in shares) Class of Warrant or Right, Outstanding Basic (USD per share) Net income per common share attributable to FTS, basic (USD per share) Earnings Per Share, Basic Software License Arrangement Software License Arrangement [Member] Liabilities: Liabilities, Fair Value Disclosure [Abstract] Personal loans Personal Loans [Member] Personal Loans Change in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Total deferred tax assets Deferred Tax Assets, Gross Discount rate Measurement Input, Discount Rate [Member] Number of outstanding shares converted Into common stock of acquiree (in shares) Reverse Acquisition, Number Of Outstanding Shares Converted Into Common Stock Of Acquiree Reverse Acquisition, Number Of Outstanding Shares Converted Into Common Stock Of Acquiree Deferred: Deferred Federal, State and Local, Tax Expense (Benefit) [Abstract] Other accounts receivable Accounts Receivable, Other, Current Accounts Receivable, Other, Current Measurement Input Type [Domain] Measurement Input Type [Domain] Affiliated Entity Affiliated Entity [Member] Technology Offering Fees Technology Offering Fees [Member] Technology Offering Fees Michael Tannenbaum [Member] Michael Tannenbaum Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Schedule of Servicing Assets Schedule of Servicing Assets at Fair Value [Table Text Block] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Proceeds from 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Variable Interest Entity [Table] Number of shares unissued (in shares) Class of Warrant or Right, Unissued Statement of Cash Flows [Abstract] Debt, current ($100,519 and $— at fair value) Debt current Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount Cash used to repurchase shares Cash 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Payment stablecoins Payment Stablecoins Payment Stablecoins Measurement Input Type [Axis] Measurement Input Type [Axis] Certificate repayment obligation Certificate Repayment Obligation, Liability, Fair Value Disclosure Certificate Repayment Obligation, Liability, Fair Value Disclosure Name Measure Name Schedule of Income (Loss) before Income Tax Domestic and Foreign Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Class of Stock [Line Items] Class of Stock [Line Items] Originations of loans held for sale Originations Of Loans Held For Sale, Operating Originations 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percentage Aggregate Outstanding Purchase Price For Mortgage Loans During Price Period, Less Than Percenatge Aggregate Outstanding Purchase Price For Mortgage Loans During Price Period, Less Than Percentage Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Loans Held for Sale and Other Receivables Schedule Of Loans Held For Sale And Other Receivables [Table Text Block] Schedule Of Loans Held For Sale And Other Receivables Assets: Assets, Fair Value Disclosure [Abstract] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Warrant Warrant [Member] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Right of use assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Level 2 Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Options, grant date intrinsic value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value Equity method investees: Beginning balance Ending balance Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Related Party Related Party [Member] Schedule of Components of Income Tax Provision Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Figure Certificate Company Figure Certificate [Member] Figure Certificate Plan Name [Axis] Plan Name [Axis] PEO PEO [Member] Non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Unrealized gains (losses) Deferred Tax Liabilities, Intangible Assets Change in fair value Loans Held For Investment, Change In Fair Value Loans Held For Investment, Change In Fair Value Forfeited and 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value per share (in USD per share) Common Stock, Par or Stated Value Per Share Warehouse Facility 11 Warehouse Facility 11 [Member] Warehouse Facility 11 Face amount of debt held by third parties Receivable with Imputed Interest, Face Amount Crypto Asset, Holding [Table] Crypto Asset, Holding [Table] Other Other Loans [Member] Other Loans Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Financed Retained Interests Line of Credit Facility, Fair Value of Amount Outstanding Operations and processing Operations And Processing Expense [Member] Operations And Processing Expense Use of Estimates Use of Estimates, Policy [Policy Text Block] Principal payments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Schedule of Assets and Liabilities Measured at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] SUBSEQUENT EVENTS Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Number of Warrants Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Current Financial Asset, Not Past Due [Member] Return to provision Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent Receivable interest rate Receivable with Imputed Interest, Effective Yield (Interest Rate) Total liabilities Total Liabilities Liabilities Todd Stevens, Restricted Stock Units [Member] Todd Stevens, Restricted Stock Units Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Customer One Customer One [Member] Customer One Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Increases related to current year tax positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Series C-1 Series C-1 Preferred Stock [Member] Series C-1 Preferred Stock Investment contributions Contributed capital Payments to Acquire Interest in Joint Venture Issuance of Series E preferred stock, net of issuance costs Stock Issued During Period, Value, New Issues Number of votes for each share of common stock held Number Of Votes For Each Share Of Common Stock Held Number Of Votes For Each Share Of Common Stock Held Counterparty Name [Axis] Counterparty Name [Axis] Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Other capital contributions Other Capital Contributions Other Capital Contributions