Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total	Total Starwood Property Trust, Inc. Stockholders’ Equity	Common stock	Additional Paid-in Capital	Treasury Stock​	Retained Earnings	Accumulated Other Comprehensive Income	Non- Controlling Interests
Beginning balance at Dec. 31, 2021	$ 214,915
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income	134,298
Distributions to non-controlling interests	(4,840)
Ending balance at Sep. 30, 2022	344,373
Beginning balance (in shares) at Dec. 31, 2021			312,268,944
Beginning balance at Dec. 31, 2021	6,433,892	$ 6,072,536	$ 3,123	$ 5,673,376	$ (138,022)	$ 493,106	$ 40,953	$ 361,356
Beginning balance (in shares) at Dec. 31, 2021					7,448,691
Increase (Decrease) in Stockholders' Equity
Proceeds from ATM Agreement (in shares)			1,415,564
Proceeds from ATM Agreement	33,321	33,321	$ 14	33,307
Proceeds from DRIP Plan (in shares)			33,037
Proceeds from DRIP Plan	770	770		770
Proceeds from employee stock purchase plan (in shares)			34,625
Proceeds from employee stock purchase plan	625	625		625
Equity offering costs	(756)	(756)		(756)
Share-based compensation (in shares)			1,455,814
Share-based compensation	29,703	29,703	$ 15	29,688
Manager fee paid in stock (in shares)			1,824,330
Manager fees paid in stock	42,695	42,695	$ 18	42,677
Net income	755,559	731,448				731,448		24,111
Dividends declared	(445,366)	(445,366)				(445,366)
Other comprehensive loss, net	(18,177)	(18,177)					(18,177)
Contributions from non-controlling interests	21,926							21,926
Distributions to non-controlling interests	(33,007)							(33,007)
Ending balance (in shares) at Sep. 30, 2022			317,032,314
Ending balance at Sep. 30, 2022	6,821,185	6,446,799	$ 3,170	5,779,687	$ (138,022)	779,188	22,776	374,386
Ending balance (in shares) at Sep. 30, 2022					7,448,691
Beginning balance at Jun. 30, 2022	322,753
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income	23,795
Distributions to non-controlling interests	(2,175)
Ending balance at Sep. 30, 2022	344,373
Beginning balance (in shares) at Jun. 30, 2022			316,660,535
Beginning balance at Jun. 30, 2022	6,774,387	6,393,996	$ 3,167	5,766,533	$ (138,022)	733,348	28,970	380,391
Beginning balance (in shares) at Jun. 30, 2022					7,448,691
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan (in shares)			10,568
Proceeds from DRIP Plan	235	235		235
Proceeds from employee stock purchase plan (in shares)			34,625
Proceeds from employee stock purchase plan	625	625		625
Share-based compensation (in shares)			218,212
Share-based compensation	9,703	9,703	$ 2	9,701
Manager fee paid in stock (in shares)			108,374
Manager fees paid in stock	2,594	2,594	$ 1	2,593
Net income	200,043	194,562				194,562		5,481
Dividends declared	(148,722)	(148,722)				(148,722)
Other comprehensive loss, net	(6,194)	(6,194)					(6,194)
Distributions to non-controlling interests	(11,486)							(11,486)
Ending balance (in shares) at Sep. 30, 2022			317,032,314
Ending balance at Sep. 30, 2022	6,821,185	6,446,799	$ 3,170	5,779,687	$ (138,022)	779,188	22,776	374,386
Ending balance (in shares) at Sep. 30, 2022					7,448,691
Beginning balance at Dec. 31, 2022	362,790
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income	51,062
Distributions to non-controlling interests	(4,193)
Ending balance at Sep. 30, 2023	$ 409,659
Beginning balance (in shares) at Dec. 31, 2022	310,675,170		318,123,861
Beginning balance at Dec. 31, 2022	$ 6,835,917	6,462,438	$ 3,181	5,807,087	$ (138,022)	769,237	20,955	373,479
Beginning balance (in shares) at Dec. 31, 2022	7,448,691				7,448,691
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan (in shares)			45,050
Proceeds from DRIP Plan	$ 852	852		852
Proceeds from employee stock purchase plan (in shares)			110,112
Proceeds from employee stock purchase plan	1,670	1,670	$ 1	1,669
Share-based compensation (in shares)			1,542,034
Share-based compensation	31,055	31,055	$ 15	31,040
Manager fee paid in stock (in shares)			843,051
Manager fees paid in stock	15,322	15,322	$ 8	15,314
Net income	282,455	268,252				268,252		14,203
Dividends declared	(451,733)	(451,733)				(451,733)
Other comprehensive loss, net	(6,841)	(6,841)					(6,841)
Distributions to non-controlling interests	$ (24,900)							(24,900)
Ending balance (in shares) at Sep. 30, 2023	313,215,417		320,664,108
Ending balance at Sep. 30, 2023	$ 6,683,797	6,321,015	$ 3,205	5,855,962	$ (138,022)	585,756	14,114	362,782
Ending balance (in shares) at Sep. 30, 2023	7,448,691				7,448,691
Beginning balance at Jun. 30, 2023	$ 408,034
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income	3,114
Distributions to non-controlling interests	(1,489)
Ending balance at Sep. 30, 2023	409,659
Beginning balance (in shares) at Jun. 30, 2023			320,217,189
Beginning balance at Jun. 30, 2023	6,784,943	6,414,494	$ 3,202	5,842,813	$ (138,022)	689,146	17,355	370,449
Beginning balance (in shares) at Jun. 30, 2023					7,448,691
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan (in shares)			13,598
Proceeds from DRIP Plan	278	278		278
Proceeds from employee stock purchase plan (in shares)			21,088
Proceeds from employee stock purchase plan	347	347		347
Share-based compensation (in shares)			319,593
Share-based compensation	10,621	10,621	$ 3	10,618
Manager fee paid in stock (in shares)			92,640
Manager fees paid in stock	1,906	1,906		1,906
Net income	48,263	47,435				47,435		828
Dividends declared	(150,825)	(150,825)				(150,825)
Other comprehensive loss, net	(3,241)	(3,241)					(3,241)
Distributions to non-controlling interests	$ (8,495)							(8,495)
Ending balance (in shares) at Sep. 30, 2023	313,215,417		320,664,108
Ending balance at Sep. 30, 2023	$ 6,683,797	$ 6,321,015	$ 3,205	$ 5,855,962	$ (138,022)	$ 585,756	$ 14,114	$ 362,782
Ending balance (in shares) at Sep. 30, 2023	7,448,691				7,448,691