Loans Held-for-Investment, Net of Allowance for Credit Losses - Schedule of Loans Held-for-Investment by Internal Risk Rating (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	73	90
Unpaid Principal Balance	$ 2,727,179	$ 3,362,006
Loans held-for-investment, net	2,583,825	3,267,815	$ 3,741,308
Current year	47,760	419,617
Year one	434,510	607,587
Year two	495,748	159,855
Year three	66,309	1,094,359
Year four	861,142	485,873
Prior	678,356	$ 500,524
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	0
Year two	0
Year three	0
Year four	0
Year five	(33,324)
Prior	(20,950)
Total	$ (54,274)
Risk Rating 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	4	8
Unpaid Principal Balance	$ 71,597	$ 291,236
Loans held-for-investment, net	71,211	287,527
Current year	0	0
Year one	0	0
Year two	0	44,141
Year three	21,744	186,506
Year four	49,467	56,880
Prior	$ 0	$ 0
Risk Rating 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	36	52
Unpaid Principal Balance	$ 1,277,491	$ 1,857,744
Loans held-for-investment, net	1,262,126	1,824,564
Current year	0	419,617
Year one	328,576	512,526
Year two	349,210	95,560
Year three	21,966	516,723
Year four	474,669	193,900
Prior	$ 87,705	$ 86,238
Risk Rating 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	24	21
Unpaid Principal Balance	$ 862,102	$ 697,532
Loans held-for-investment, net	842,175	689,196
Current year	47,760	0
Year one	105,934	95,061
Year two	146,538	20,154
Year three	22,599	234,019
Year four	189,259	99,311
Prior	$ 330,085	$ 240,651
Risk Rating 4
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	4	5
Unpaid Principal Balance	$ 192,104	$ 268,236
Loans held-for-investment, net	174,313	258,570
Current year	0	0
Year one	0	0
Year two	0	0
Year three	0	0
Year four	25,807	135,782
Prior	$ 148,506	$ 122,788
Risk Rating 5
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	5	4
Unpaid Principal Balance	$ 323,885	$ 247,258
Loans held-for-investment, net	234,000	207,958
Current year	0	0
Year one	0	0
Year two	0	0
Year three	0	157,111
Year four	121,940	0
Prior	$ 112,060	$ 50,847