Loans Held for Investment and Loans Held for Investment at Fair Value - Summary of UPB and Amortized Cost Basis of Loans in COVID-19 Forbearance Program (Details) - COVID 19 Forbearance Program - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
UPB Beginning balance	$ 165,141	$ 174,571	$ 201,005
UPB Foreclosures	(2,329)	(3,962)	(833)
UPB Repayments	(4,295)	(12,092)	(25,601)
UPB Ending balance	158,517	158,517	174,571
UPB Performing/Accruing, Amount	117,802	117,802	132,389
UPB Nonperforming/Nonaccrual, Amount	$ 40,715	$ 40,715	$ 42,182
UPB Performing/Accruing, Percentage	74.30%	74.30%	75.80%
UPB Nonperforming/Nonaccrual, Percentage	25.70%	25.70%	24.20%
Amortized Cost Beginning balance	$ 166,983	$ 176,515	$ 203,346
Amortized Cost Foreclosures	(2,378)	(4,055)	(830)
Amortized Cost Repayments	(4,382)	(12,237)	(26,001)
Amortized Cost Ending balance	160,223	160,223	176,515
Amortized Cost Performing/Accruing, Amount	119,065	119,065	133,771
Amortized Cost Nonperforming/Nonaccrual, Amount	$ 41,158	$ 41,158	$ 42,744
Amortized Cost Performing/Accruing, Percentage	74.30%	74.30%	75.80%
Amortized Cost Nonperforming/Nonaccrual, Percentage	25.70%	25.70%	24.20%