Loans Held for Investment and Loans Held for Investment at Fair Value - Schedule of Loans Held for Investment Pledged as Collateral for Warehouse Facility Agreements and Securitized Debt Issued (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Total	$ 3,657,571	$ 3,075,047
Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	377,963	418,749
2013 Repurchase Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	132,505	170,185
2021 Repurchase Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	103,787	101,024
Bank Credit Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	39,619	39,087
2021 Term Repurchase Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	41,628	104,594
July 2021 Term Repurchase Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	30,923	3,859
2023 Repurchase Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	29,501
2016-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total		39,720
2017-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	50,554	67,048
2018-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	37,810	48,139
2018-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	85,122	104,791
2019-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	87,677	104,249
2019-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	73,166	91,025
2019-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	64,403	75,618
2020-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	116,843	144,913
2020-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	69,085	81,259
2021-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	182,184	208,875
2021-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	148,989	172,144
2021-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	159,565	178,861
2021-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	245,945	275,741
2022-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	245,372	262,526
2022-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	222,333	245,339
2022-MC1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	73,840	97,246
2022-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	278,268	299,638
2022-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	298,758	326,627
2022-5 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	223,112	$ 251,288
2023-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	217,220
2023-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	214,221
2023-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	255,699
2023-RTL1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	79,465
2023-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	$ 227,940