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Fair Value of Financial Instruments - Valuation for Level 3 Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total (losses)/gains (realized/unrealized)
Balance at beginning of period	$ 3,471,854	$ 20,659,268	$ 12,503,064
Included in earnings	99,416	138,979	620,942
Included in other comprehensive income (loss)			(13,665)
Transfers in	0	500,793
Transfers out	(4,133)	(254,525)	(913)
Transfers to securitization trust	0	0
Funding/Contributions	145,143	80,500	50,000
Paydowns/Distributions	(1,281,879)	(744,378)	(1,182,762)
Recovery of charge-off	0	35	(3,257)
Sales	(77,127)	(17,478,375)	(76,583)
Purchases	1,581,979	569,557	8,762,442
Balance at the end of period	3,935,253	3,471,854	20,659,268
VIE, Primary Beneficiary
Total (losses)/gains (realized/unrealized)
Recovery of charge-off			(3,257)
VIE, Primary Beneficiary | Consolidated SLST
Total (losses)/gains (realized/unrealized)
Balance at beginning of period	1,266,785	1,328,886	0
Included in earnings	(35,953)	27,898	(445)
Included in other comprehensive income (loss)			0
Transfers in	0	0
Transfers out	0	0	0
Transfers to securitization trust	0	0
Funding/Contributions	0	0	0
Paydowns/Distributions	(159,950)	(89,999)	(3,729)
Recovery of charge-off	0	0	0
Sales	0	0	0
Purchases	0	0	1,333,060
Balance at the end of period	1,070,882	1,266,785	1,328,886
VIE, Primary Beneficiary | Consolidated K-Series
Total (losses)/gains (realized/unrealized)
Balance at beginning of period	0	17,816,746	11,679,847
Included in earnings		41,795	533,094
Included in other comprehensive income (loss)			0
Transfers in		0
Transfers out		(237,297)	0
Transfers to securitization trust		0
Funding/Contributions		0	0
Paydowns/Distributions		(239,796)	(992,912)
Recovery of charge-off		35	(3,257)
Sales		(17,381,483)	0
Purchases		0	6,599,974
Balance at the end of period		0	17,816,746
Residential loans
Total (losses)/gains (realized/unrealized)
Balance at beginning of period	1,090,930	1,429,754	737,523
Included in earnings	36,844	(9,240)	55,459
Included in other comprehensive income (loss)			0
Transfers in	0	164,279
Transfers out	(2,080)	(6,017)	(913)
Transfers to securitization trust	305,433	(651,911)
Funding/Contributions	0	0	0
Paydowns/Distributions	(618,790)	(308,600)	(171,909)
Recovery of charge-off	0	0	0
Sales	(74,751)	(96,892)	(19,814)
Purchases	1,576,570	569,557	829,408
Balance at the end of period	1,703,290	1,090,930	1,429,754
Residential loans held in securitization trusts
Total (losses)/gains (realized/unrealized)
Balance at beginning of period	691,451	0
Included in earnings	43,001	31,402
Transfers in	0	46,572
Transfers out	(2,053)	(2,492)
Transfers to securitization trust	(305,433)	651,911
Funding/Contributions	0	0
Paydowns/Distributions	(239,436)	(35,942)
Recovery of charge-off	0	0
Sales	(2,376)	0
Purchases	5,409	0
Balance at the end of period	801,429	691,451	0
Multi-family loans
Total (losses)/gains (realized/unrealized)
Balance at beginning of period	163,593
Included in earnings	18,795
Transfers in	0
Transfers out	0
Transfers to securitization trust	0
Funding/Contributions	37,678
Paydowns/Distributions	(100,045)
Recovery of charge-off	0
Sales	0
Purchases	0
Balance at the end of period	120,021	163,593
Preferred equity and mezzanine loan investments
Total (losses)/gains (realized/unrealized)
Balance at beginning of period	163,593	0
Included in earnings		20,454
Transfers in		182,465
Transfers out		(8,719)
Transfers to securitization trust		0
Funding/Contributions		14,164
Paydowns/Distributions		(44,771)
Recovery of charge-off		0
Sales		0
Purchases		0
Balance at the end of period		163,593	0
CMBS held in re-securitization trusts
Total (losses)/gains (realized/unrealized)
Balance at beginning of period		0	52,700
Included in earnings			17,734
Included in other comprehensive income (loss)			(13,665)
Transfers out			0
Funding/Contributions			0
Paydowns/Distributions			0
Recovery of charge-off			0
Sales			(56,769)
Purchases			0
Balance at the end of period			0
Equity investments
Total (losses)/gains (realized/unrealized)
Balance at beginning of period	259,095	83,882	32,994
Included in earnings	36,729	26,670	15,100
Included in other comprehensive income (loss)			0
Transfers in	0	107,477
Transfers out	0	0	0
Transfers to securitization trust	0	0
Funding/Contributions	107,465	66,336	50,000
Paydowns/Distributions	(163,658)	(25,270)	(14,212)
Recovery of charge-off	0	0	0
Sales	0	0	0
Purchases	0	0	0
Balance at the end of period	$ 239,631	$ 259,095	$ 83,882

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