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	Sep. 30, 2025	Dec. 31, 2024
Accounts Notes And Loans Receivable [Line Items]
Total	$ 5,762,970	$ 4,551,583
Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	433,234	422,520
2013 Repurchase Agreement \| Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	158,669	133,577
2021/2024 Repurchase Agreements \| Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	139,782	148,676
2021 Term Repurchase Agreement \| Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	39,352	74,324
2023 Repurchase Agreement \| Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	61,995	42,613
2024 Bank Credit Agreement \| Asset Pledged as Collateral Without Right
Accounts Notes And Loans Receivable [Line Items]
Total pledged loans	33,436	23,330
2017-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	31,456	39,231
2018-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	24,509	28,564
2018-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	53,125	62,845
2019-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	61,184	71,521
2019-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	44,888	52,417
2019-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	43,353	52,177
2020-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	85,580	98,858
2021-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	143,331	162,750
2021-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	116,833	130,363
2021-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	122,492	136,891
2021-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	201,422	219,907
2022-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	204,536	222,909
2022-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	182,871	201,363
2022-MC1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total		58,133
2022-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	228,666	253,621
2022-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	225,441	254,668
2022-5 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	153,400	187,078
2023-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	154,982	180,941
2023-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	124,396	165,155
2023-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	158,810	200,943
2023-RTL1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total		85,530
2023-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	147,461	185,013
2024-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	146,038	188,638
2024-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	218,822	271,542
2024-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	172,420	198,640
2024-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	206,506	248,788
2024-5 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	262,032	293,881
2024-6 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	275,686	$ 299,216
2025-1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	336,439
2025-RTL1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	118,498
2025-2 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	374,790
2025-MC1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	96,786
2025-3 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	386,034
2025-P1 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	192,424
2025-4 Trust
Accounts Notes And Loans Receivable [Line Items]
Total	$ 467,759

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