Condensed Consolidated Statements of Equity $ in Thousands	USD ($) shares	Cumulative Effect, Period of Adoption, Adjustment USD ($)	Total Starwood Property Trust, Inc. Stockholders’ Equity USD ($)	Total Starwood Property Trust, Inc. Stockholders’ Equity Cumulative Effect, Period of Adoption, Adjustment USD ($)	Common stock USD ($) shares	Additional Paid-in Capital USD ($)	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjustment USD ($)	Treasury Stock​ USD ($) shares	Retained Earnings (Accumulated Deficit) USD ($)	Retained Earnings (Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment USD ($)	Accumulated Other Comprehensive Income USD ($)	Non- Controlling Interests USD ($)
Beginning balance (in shares) at Dec. 31, 2020 | shares					292,091,601			7,448,691
Beginning balance at Dec. 31, 2020	$ 4,862,576	$ (1,536)	$ 4,488,898	$ (1,536)	$ 2,921	$ 5,209,739	$ (3,755)	$ (138,022)	$ (629,733)	$ 2,219	$ 43,993	$ 373,678
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan (in shares) | shares					12,234
Proceeds from DRIP Plan	262		262		$ 0	262
Redemption of Class A Units (in shares)					50,000
Redemption of Class A Units	0		1,039		$ 1	1,038						(1,039)
Equity offering costs	(22)		(22)			(22)
Share-based compensation (in shares) | shares					1,814,414
Share-based compensation	10,310		10,310		$ 18	10,292
Manager fee paid in stock (in shares) | shares					332,002
Manager fees paid in stock	7,486		7,486		$ 3	7,483
Net income	122,526		111,378						111,378			11,148
Dividends declared	(138,614)		(138,614)						(138,614)
Other comprehensive loss, net	(2,339)		(2,339)								(2,339)
Contributions from non-controlling interests	2,969											2,969
Distributions to non-controlling interests	(8,833)											(8,833)
Ending balance (in shares) at Mar. 31, 2021 | shares					294,300,251			7,448,691
Ending balance at Mar. 31, 2021	4,854,785		4,476,862		$ 2,943	5,225,037		$ (138,022)	(654,750)		41,654	377,923
Beginning balance at Dec. 31, 2020	0
Ending balance at Mar. 31, 2021	$ 0
Beginning balance (in shares) at Dec. 31, 2021 | shares	312,268,944				312,268,944			7,448,691
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
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan (in shares) | shares					10,261
Proceeds from DRIP Plan	251		251			251
Redemption of Class A Units	0		0
Equity offering costs	(89)		(89)			(89)
Share-based compensation (in shares) | shares					1,012,963
Share-based compensation	10,093		10,093		$ 10	10,083
Manager fee paid in stock (in shares) | shares					1,068,828
Manager fees paid in stock	25,417		25,417		$ 11	25,406
Net income	336,594		324,599						324,599			11,995
Dividends declared	(147,828)		(147,828)						(147,828)
Other comprehensive loss, net	(5,284)		(5,284)								(5,284)
Contributions from non-controlling interests	4,690											4,690
Distributions to non-controlling interests	$ (9,768)											(9,768)
Ending balance (in shares) at Mar. 31, 2022 | shares	314,360,996				314,360,996			7,448,691
Ending balance at Mar. 31, 2022	$ 6,647,968		$ 6,279,695		$ 3,144	$ 5,709,027		$ (138,022)	$ 669,877		$ 35,669	$ 368,273
Beginning balance at Dec. 31, 2021	214,915
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income	47,720
Distributions to non-controlling interests	(950)
Ending balance at Mar. 31, 2022	$ 261,685