Real Estate Owned (REO) and Mortgages Payable - Summary of REO Transactions and Valuation Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Real Estate Owned REO Details [Line Items]
Balance, beginning of period			$ 8,258
Valuation allowance adjustment	$ (261)	$ 0	(261)	$ 294
Balance, end of period	6,028		6,028
R E O Balance
Real Estate Owned REO Details [Line Items]
Balance, beginning of period	10,458	12,044	10,458	12,044
Valuation allowance adjustment	0	0	0	0
Dispositions	(4,430)	(1,586)	(4,430)	(1,586)
Balance, end of period	6,028	10,458	6,028	10,458
Valuation Allowance
Real Estate Owned REO Details [Line Items]
Valuation allowance, balance, beginning of period	(2,200)	(3,533)	(2,200)	(3,239)
Valuation allowance adjustment	261	0	261	(294)
Dispositions	1,939	1,333	1,939	1,333
Valuation allowance, Balance, end of period	0	(2,200)	0	(2,200)
R E O Net
Real Estate Owned REO Details [Line Items]
Balance, beginning of period	8,258	8,511	8,258	8,805
Valuation allowance adjustment	261	0	261	(294)
Dispositions	2,491	253	2,491	253
Balance, end of period	$ 6,028	$ 8,258	$ 6,028	$ 8,258