Loans Held for Investment at Amortized Cost and Loans Held for Investment at Fair Value - Schedule of Loans Held for Investment Pledged as Collateral for Warehouse Facilities and Securitized Debt Issued (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Accounts Notes And Loans Receivable [Line Items]
Total	$ 6,355,255	$ 6,050,646
Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	150,873	410,953
2013 Repurchase Agreement \| Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	0	165,484
2021/2024 Repurchase Agreements \| Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	0	134,901
2021 Term Repurchase Agreement \| Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	0	23,478
2023 Repurchase Agreement \| Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	91,052	50,611
2024 Bank Credit Agreement \| Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	59,821	36,479
2017-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	27,219	29,111
2018-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	20,216	21,618
2018-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	48,405	49,759
2019-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	52,186	58,324
2019-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	40,727	42,618
2019-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	39,719	41,166
2020-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	80,691	83,154
2021-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	131,618	135,627
2021-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	106,452	112,332
2021-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	113,650	119,070
2021-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	185,812	190,186
2022-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	193,620	198,203
2022-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	174,205	178,346
2022-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	202,845	206,020
2022-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	213,868	221,652
2022-5 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	136,472	146,126
2023-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	132,456	141,805
2023-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	90,800	94,269
2023-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	114,094	124,129
2023-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	103,392	118,953
2024-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	132,804	140,464
2024-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	172,930	183,376
2024-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	138,287	145,659
2024-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	168,827	175,820
2024-5 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	226,145	246,456
2024-6 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	253,670	268,354
2025-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	306,618	321,431
2025-RTL1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	121,225	117,733
2025-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	361,470	369,814
2025-MC1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	79,760	86,083
2025-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	365,048	377,229
2025-P1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	182,698	190,012
2025-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	452,161	459,557
2025-P2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	203,302	210,368
2025-5 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	439,029	$ 445,822
2026-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	353,065
2026-P1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	$ 189,769

Loans Held for Investment at Amortized Cost and Loans Held for Investment at Fair Value - Schedule of Loans Held for Investment Pledged as Collateral for Warehouse Facilities and Securitized Debt Issued (Details) - USD ($)
$ in Thousands