Loans and Investments - Summary of Impaired Loans (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024 USD ($) loan	Dec. 31, 2023 USD ($) loan
Loans and Investments
UPB	$ 592,543	$ 427,929
Carrying Value	558,125	404,896
Allowance for Credit Losses	$ 140,374	$ 120,611
Wtd. Avg. First Dollar LTV Ratio	0	0
Wtd. Avg. Last Dollar LTV Ratio	0.97	0.99
Number of impaired loans (less unearned revenue and other holdbacks and adjustments) by asset class | loan	25	19
Multifamily
Loans and Investments
UPB	$ 437,108	$ 272,494
Carrying Value	413,500	260,291
Allowance for Credit Losses	$ 57,513	$ 37,750
Wtd. Avg. First Dollar LTV Ratio	0	0
Wtd. Avg. Last Dollar LTV Ratio	0.97	1
Land
Loans and Investments
UPB	$ 134,215	$ 134,215
Carrying Value	127,868	127,868
Allowance for Credit Losses	$ 77,869	$ 77,869
Wtd. Avg. First Dollar LTV Ratio	0	0
Wtd. Avg. Last Dollar LTV Ratio	0.99	0.99
Retail
Loans and Investments
UPB	$ 19,520	$ 19,520
Carrying Value	15,057	15,037
Allowance for Credit Losses	$ 3,292	$ 3,292
Wtd. Avg. First Dollar LTV Ratio	0	0
Wtd. Avg. Last Dollar LTV Ratio	0.88	0.88
Commercial
Loans and Investments
UPB	$ 1,700	$ 1,700
Carrying Value	1,700	1,700
Allowance for Credit Losses	$ 1,700	$ 1,700
Wtd. Avg. First Dollar LTV Ratio	0	0
Wtd. Avg. Last Dollar LTV Ratio	1	1