Fair Value Measurements - Assets and Liabilities, Not at FV (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets:
Paycheck Protection Program loans	$ 165	$ 576
Investments held to maturity	3,446	3,306
Purchased future receivables, net	9,483	8,246
Investment in unconsolidated joint venture	7,360	8,094
Liabilities:
Paycheck Protection Program Liquidity Facility (PPPLF) borrowings	36,036	201,011
Senior secured notes, net	345,127	343,355
Carrying Amount
Assets:
Loans, held-for-investment	10,622,137	9,873,711
Paycheck Protection Program loans	34,432	186,409
Servicing rights	102,837	87,117
Total assets	10,759,406	10,147,237
Liabilities:
Secured borrowings	2,102,075	2,663,735
Paycheck Protection Program Liquidity Facility (PPPLF) borrowings	36,036	201,011
Securitized debt obligations of consolidated VIEs	5,068,453	4,903,350
Senior secured notes, net	345,127	343,355
Guaranteed loan financing	844,540	264,889
Convertible note, net		114,397
Corporate debt, net	764,908	662,665
Total liabilities	9,161,139	9,153,402
Fair Value
Assets:
Loans, held-for-investment	10,380,893	9,605,901
Paycheck Protection Program loans	35,637	196,222
Servicing rights	113,715	91,698
Total assets	10,530,245	9,893,821
Liabilities:
Secured borrowings	2,102,075	2,663,735
Paycheck Protection Program Liquidity Facility (PPPLF) borrowings	36,036	201,011
Securitized debt obligations of consolidated VIEs	5,022,057	4,748,291
Senior secured notes, net	317,239	312,975
Guaranteed loan financing	889,744	275,316
Convertible note, net		113,823
Corporate debt, net	731,104	614,744
Total liabilities	$ 9,098,255	$ 8,929,895

Fair value portion of corporate debt payable.

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Borrowings from the Paycheck Protection Program Liquidity Facility (PPPLF) to support the origination of PPP loans.

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Paycheck Protection Program loans held at fair value.

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Amount of net purchased future receivables,

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Including the current and noncurrent portions, carrying value as of the balance sheet date of senior secured notes (with maturities initially due after one year or beyond the operating cycle if longer).

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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Fair value portion of investments accounted under the equity method.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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