Fair Value of Assets and Liabilities - Sensitivity Analysis of Loans Held for Investment (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment at fair value	[1]	$ 404,119	$ 925,938
Loans Held for Investment | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates, impact of 100 basis point increase		(3,057)	(7,471)
Discount rates, impact of 200 basis point increase		(6,071)	(14,830)
Expected credit loss rates on underlying loans, impact of 10% increase		(2,454)	(5,574)
Expected credit loss rates on underlying loans, impact of 20% increase		(5,006)	(11,307)
Expected prepayment rates, impact of 10% increase		(2,146)	(4,311)
Expected prepayment rates, impact of 20% increase		$ (4,157)	$ (7,480)
Loans Held for Investment | Fair Value, Measurements, Recurring | Measurement Input, Expected Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Expected weighted-average life (in years)		1 year	10 months 24 days

[1] Includes amounts in consolidated variable interest entities (VIEs). See “Notes to Condensed Consolidated Financial Statements – Note 6. Securitizations and Variable Interest Entities.”