Loans Held for Investment and Loans Held for Investment at Fair Value - Schedule of Loans Held for Investment Pledged as Collateral for Warehouse Facilities and Securitizations Issued (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Total	$ 4,113,959	$ 3,657,571
Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	304,239	377,963
2013 Repurchase Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	125,007	132,505
2021 Repurchase Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	53,279	103,787
Bank Credit Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	33,475	39,619
2021 Term Repurchase Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	35,396	41,628
July 2021 Term Repurchase Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	33,823	30,923
2023 Repurchase Agreement | Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	23,259	29,501
2017-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	44,385	50,554
2018-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	32,453	37,810
2018-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	73,594	85,122
2019-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	80,669	87,677
2019-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	60,581	73,166
2019-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	57,825	64,403
2020-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	107,542	116,843
2020-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	65,137	69,085
2021-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	172,053	182,184
2021-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	138,712	148,989
2021-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	149,432	159,565
2021-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	230,849	245,945
2022-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	232,804	245,372
2022-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	212,487	222,333
2022-MC1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	62,803	73,840
2022-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	264,744	278,268
2022-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	283,443	298,758
2022-5 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	209,134	223,112
2023-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	204,048	217,220
2023-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	191,726	214,221
2023-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	244,105	255,699
2023-RTL1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	85,123	79,465
2023-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	211,532	$ 227,940
2024-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	207,688
2024-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	282,928
2024-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	$ 208,162