Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Assets:
Restricted cash	$ 9,217	$ 11,639	$ 7,921
Loans held for investment, net	3,118,799	2,527,564
Loans held for investment, at fair value	1,351	1,359
Mortgage servicing rights	8,438	7,152
Liabilities:
Secured financing, net	209,227	162,845
Securitizations, net	2,477,226	1,911,879	$ 1,558,163
Carrying Value
Assets:
Cash	46,250	35,965
Restricted cash	9,217	11,639
Loans held for sale, net		87,908
Loans held for investment, net	3,118,799	2,527,564
Loans held for investment, at fair value	1,351	1,359
Accrued interest receivables	15,820	13,159
Mortgage servicing rights	8,438	7,152
Liabilities:
Secured financing, net	209,227	162,845
Warehouse repurchase facilities, net	208,390	301,069
Securitizations, net	2,477,226	1,911,879
Accrued interest payable	13,074	6,254
Estimate of Fair Value Measurement
Assets:
Cash	46,250	35,965
Restricted cash	9,217	11,639
Loans held for sale, net		87,908
Loans held for investment, net	3,295,277	2,655,357
Loans held for investment, at fair value	1,351	1,359
Accrued interest receivables	15,820	13,159
Mortgage servicing rights	8,438	7,152
Liabilities:
Secured financing, net	212,827	170,843
Warehouse repurchase facilities, net	208,390	301,069
Securitizations, net	2,312,506	1,931,002
Accrued interest payable	13,074	6,254
Level 1 \| Estimate of Fair Value Measurement
Assets:
Cash	46,250	35,965
Restricted cash	9,217	11,639
Accrued interest receivables	15,820	13,159
Liabilities:
Accrued interest payable	13,074	6,254
Level 2 \| Estimate of Fair Value Measurement
Liabilities:
Warehouse repurchase facilities, net	208,390	301,069
Level 3 \| Estimate of Fair Value Measurement
Assets:
Loans held for sale, net		87,908
Loans held for investment, net	3,295,277	2,655,357
Loans held for investment, at fair value	1,351	1,359
Mortgage servicing rights	8,438	7,152
Liabilities:
Secured financing, net	212,827	170,843
Securitizations, net	$ 2,312,506	$ 1,931,002

Fair value portion of accrued expenses.

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