Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets:
Restricted cash	$ 16,808	$ 11,639	$ 7,020
Loans held for investment, net	3,272,390	2,527,564
Loans held for investment, at fair value	276,095	1,359
Mortgage servicing rights	9,238	7,152
Liabilities:
Secured financing, net	209,846	162,845
Securitizations, net	2,736,290	1,911,879
Carrying Value
Assets:
Cash	45,248	35,965
Restricted cash	16,808	11,639
Loans held for sale, at fair value		87,908
Loans held for investment, net	3,272,390	2,527,564
Loans held for investment, at fair value	276,095	1,359
Accrued interest receivables	20,463	13,159
Mortgage servicing rights	9,238	7,152
Liabilities:
Secured financing, net	209,846	162,845
Warehouse and repurchase facilities, net	330,814	301,069
Securitizations, net	2,736,290	1,911,879
Accrued interest payable	16,369	6,254
Estimate of Fair Value Measurement
Assets:
Cash	45,248	35,965
Restricted cash	16,808	11,639
Loans held for sale, at fair value		87,908
Loans held for investment, net	3,201,850	2,655,357
Loans held for investment, at fair value	276,095	1,359
Accrued interest receivables	20,463	13,159
Mortgage servicing rights	9,238	7,152
Liabilities:
Secured financing, net	211,854	170,843
Warehouse and repurchase facilities, net	330,814	301,069
Securitizations, net	2,522,010	1,931,002
Accrued interest payable	16,369	6,254
Level 1 \| Estimate of Fair Value Measurement
Assets:
Cash	45,248	35,965
Restricted cash	16,808	11,639
Accrued interest receivables	20,463	13,159
Liabilities:
Accrued interest payable	16,369	6,254
Level 2 \| Estimate of Fair Value Measurement
Liabilities:
Warehouse and repurchase facilities, net		301,069
Level 3 \| Estimate of Fair Value Measurement
Assets:
Loans held for sale, at fair value		87,908
Loans held for investment, net	3,201,850	2,655,357
Loans held for investment, at fair value	276,095	1,359
Mortgage servicing rights	9,238	7,152
Liabilities:
Secured financing, net	211,854	170,843
Securitizations, net	$ 2,522,010	$ 1,931,002

Fair value portion of accrued expenses.

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