Segment Data - Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues:
Interest income from loans	$ 353,923	$ 463,492
Interest income from investment securities	12,221	18,206
Servicing fees	17,460	9,689
Rental income	29,183	28,847
Other revenues	5,393	2,854
Total revenues	418,180	523,088
Costs and expenses:
Management fees	40,763	46,014
Interest expense	292,158	355,956
General and administrative	48,147	50,663
Costs of rental operations	14,820	10,344
Depreciation and amortization	11,484	9,818
Credit loss (reversal) provision, net	(24,999)	35,839
Other expense	1,851	674
Total costs and expenses	384,224	509,308
Other income (loss):
Change in net assets related to consolidated VIEs	28,691	10,086
Change in fair value of servicing rights	753	228
Change in fair value of investment securities, net	(173)	915
Change in fair value of mortgage loans, net	58,404	(29,013)
Earnings from unconsolidated entities	537	7,675
(Loss) gain on sale of investments and other assets, net	0	91,962
(Loss) gain on derivative financial instruments, net	(39,689)	101,939
Foreign currency gain (loss), net	34,791	(41,870)
Loss on extinguishment of debt	0	(1,454)
Other (loss) income, net	(1,313)	(2,630)
Total other income (loss)	85,911	147,286
Income (loss) before income taxes	119,867	161,066
Income tax (provision) benefit	(3,766)	(1,206)
Net income	116,101	159,860
Net (income) loss attributable to non-controlling interests	(3,846)	(5,528)
Net income (loss) attributable to Starwood Property Trust, Inc.	112,255	154,332
Primary Beneficiary
Other income (loss):
Income from affordable housing fund investments	3,910	9,448
Subtotal
Revenues:
Interest income from loans	353,923	463,492
Interest income from investment securities	52,217	52,687
Servicing fees	21,894	13,167
Rental income	29,183	28,847
Other revenues	5,393	2,854
Total revenues	462,610	561,047
Costs and expenses:
Management fees	40,763	46,014
Interest expense	292,353	356,166
General and administrative	48,147	50,663
Costs of rental operations	14,820	10,344
Depreciation and amortization	11,484	9,818
Credit loss (reversal) provision, net	(24,999)	35,839
Other expense	1,851	674
Total costs and expenses	384,419	509,518
Other income (loss):
Change in net assets related to consolidated VIEs	0	0
Change in fair value of servicing rights	(114)	(3,381)
Change in fair value of investment securities, net	(15,232)	(23,449)
Change in fair value of mortgage loans, net	58,404	(29,013)
Earnings from unconsolidated entities	919	7,985
(Loss) gain on sale of investments and other assets, net		91,962
(Loss) gain on derivative financial instruments, net	(39,689)	101,939
Foreign currency gain (loss), net	34,791	(41,870)
Loss on extinguishment of debt		(1,454)
Other (loss) income, net	(1,313)	(2,630)
Total other income (loss)	41,676	109,537
Income (loss) before income taxes	119,867	161,066
Income tax (provision) benefit	(3,766)	(1,206)
Net income	116,101	159,860
Net (income) loss attributable to non-controlling interests	(3,846)	(5,528)
Net income (loss) attributable to Starwood Property Trust, Inc.	112,255	154,332
Subtotal | Primary Beneficiary
Other income (loss):
Income from affordable housing fund investments	3,910	9,448
Operating segment | Commercial and Residential Lending Segment
Revenues:
Interest income from loans	290,299	394,472
Interest income from investment securities	23,889	31,405
Servicing fees	65	128
Rental income	8,203	3,565
Other revenues	3,010	983
Total revenues	325,466	430,553
Costs and expenses:
Management fees	180	192
Interest expense	165,551	236,149
General and administrative	14,606	16,828
Costs of rental operations	5,518	2,025
Depreciation and amortization	3,607	1,949
Credit loss (reversal) provision, net	(25,759)	34,977
Other expense	(25)	730
Total costs and expenses	163,678	292,850
Other income (loss):
Change in net assets related to consolidated VIEs	0	0
Change in fair value of servicing rights	0	0
Change in fair value of investment securities, net	7,397	(6,991)
Change in fair value of mortgage loans, net	42,574	(40,677)
Earnings from unconsolidated entities	1,296	7,345
(Loss) gain on sale of investments and other assets, net		(41)
(Loss) gain on derivative financial instruments, net	(65,838)	110,952
Foreign currency gain (loss), net	34,616	(41,818)
Loss on extinguishment of debt		315
Other (loss) income, net	(489)	(2,676)
Total other income (loss)	19,556	26,409
Income (loss) before income taxes	181,344	164,112
Income tax (provision) benefit	(294)	(721)
Net income	181,050	163,391
Net (income) loss attributable to non-controlling interests	(3)	(3)
Net income (loss) attributable to Starwood Property Trust, Inc.	181,047	163,388
Operating segment | Commercial and Residential Lending Segment | Primary Beneficiary
Other income (loss):
Income from affordable housing fund investments	0	0
Operating segment | Infrastructure Lending Segment
Revenues:
Interest income from loans	60,456	66,398
Interest income from investment securities	154	138
Servicing fees	0	0
Rental income	0	0
Other revenues	1,015	392
Total revenues	61,625	66,928
Costs and expenses:
Management fees	0	0
Interest expense	35,154	38,973
General and administrative	5,018	5,955
Costs of rental operations	0	0
Depreciation and amortization	10	14
Credit loss (reversal) provision, net	760	862
Other expense	1,923	0
Total costs and expenses	42,865	45,804
Other income (loss):
Change in net assets related to consolidated VIEs	0	0
Change in fair value of servicing rights	0	0
Change in fair value of investment securities, net	0	0
Change in fair value of mortgage loans, net	0	0
Earnings from unconsolidated entities	(622)	327
(Loss) gain on sale of investments and other assets, net		0
(Loss) gain on derivative financial instruments, net	(19)	122
Foreign currency gain (loss), net	236	(84)
Loss on extinguishment of debt		(560)
Other (loss) income, net	0	40
Total other income (loss)	(405)	(155)
Income (loss) before income taxes	18,355	20,969
Income tax (provision) benefit	(133)	128
Net income	18,222	21,097
Net (income) loss attributable to non-controlling interests	0	0
Net income (loss) attributable to Starwood Property Trust, Inc.	18,222	21,097
Operating segment | Infrastructure Lending Segment | Primary Beneficiary
Other income (loss):
Income from affordable housing fund investments	0	0
Operating segment | Property Segment
Revenues:
Interest income from loans	0	0
Interest income from investment securities	0	0
Servicing fees	0	0
Rental income	16,315	20,775
Other revenues	234	127
Total revenues	16,549	20,902
Costs and expenses:
Management fees	0	0
Interest expense	8,977	13,298
General and administrative	1,414	1,263
Costs of rental operations	6,018	5,707
Depreciation and amortization	5,865	5,855
Credit loss (reversal) provision, net	0	0
Other expense	(82)	0
Total costs and expenses	22,192	26,123
Other income (loss):
Change in net assets related to consolidated VIEs	0	0
Change in fair value of servicing rights	0	0
Change in fair value of investment securities, net	0	0
Change in fair value of mortgage loans, net	0	0
Earnings from unconsolidated entities	0	0
(Loss) gain on sale of investments and other assets, net		92,003
(Loss) gain on derivative financial instruments, net	(98)	1,721
Foreign currency gain (loss), net	(61)	32
Loss on extinguishment of debt		(1,209)
Other (loss) income, net	(828)	0
Total other income (loss)	2,923	101,995
Income (loss) before income taxes	(2,720)	96,774
Income tax (provision) benefit	0	0
Net income	(2,720)	96,774
Net (income) loss attributable to non-controlling interests	(5,084)	(6,225)
Net income (loss) attributable to Starwood Property Trust, Inc.	(7,804)	90,549
Operating segment | Property Segment | Primary Beneficiary
Other income (loss):
Income from affordable housing fund investments	3,910	9,448
Operating segment | Investing and Servicing Segment
Revenues:
Interest income from loans	3,168	2,622
Interest income from investment securities	28,174	21,144
Servicing fees	21,829	13,039
Rental income	4,665	4,507
Other revenues	1,039	748
Total revenues	58,875	42,060
Costs and expenses:
Management fees	0	0
Interest expense	8,133	8,317
General and administrative	22,501	23,467
Costs of rental operations	3,284	2,612
Depreciation and amortization	1,751	1,749
Credit loss (reversal) provision, net	0	0
Other expense	35	(56)
Total costs and expenses	35,704	36,089
Other income (loss):
Change in net assets related to consolidated VIEs	0	0
Change in fair value of servicing rights	(114)	(3,381)
Change in fair value of investment securities, net	(22,629)	(16,458)
Change in fair value of mortgage loans, net	15,830	11,664
Earnings from unconsolidated entities	245	313
(Loss) gain on sale of investments and other assets, net		0
(Loss) gain on derivative financial instruments, net	(1,073)	3,012
Foreign currency gain (loss), net	0	0
Loss on extinguishment of debt		0
Other (loss) income, net	4	6
Total other income (loss)	(7,737)	(4,844)
Income (loss) before income taxes	15,434	1,127
Income tax (provision) benefit	(3,339)	(613)
Net income	12,095	514
Net (income) loss attributable to non-controlling interests	1,241	700
Net income (loss) attributable to Starwood Property Trust, Inc.	13,336	1,214
Operating segment | Investing and Servicing Segment | Primary Beneficiary
Other income (loss):
Income from affordable housing fund investments	0	0
Corporate
Revenues:
Interest income from loans	0	0
Interest income from investment securities	0	0
Servicing fees	0	0
Rental income	0	0
Other revenues	95	604
Total revenues	95	604
Costs and expenses:
Management fees	40,583	45,822
Interest expense	74,538	59,429
General and administrative	4,608	3,150
Costs of rental operations	0	0
Depreciation and amortization	251	251
Credit loss (reversal) provision, net	0	0
Other expense	0	0
Total costs and expenses	119,980	108,652
Other income (loss):
Change in net assets related to consolidated VIEs	0	0
Change in fair value of servicing rights	0	0
Change in fair value of investment securities, net	0	0
Change in fair value of mortgage loans, net	0	0
Earnings from unconsolidated entities	0	0
(Loss) gain on sale of investments and other assets, net		0
(Loss) gain on derivative financial instruments, net	27,339	(13,868)
Foreign currency gain (loss), net	0	0
Loss on extinguishment of debt		0
Other (loss) income, net	0	0
Total other income (loss)	27,339	(13,868)
Income (loss) before income taxes	(92,546)	(121,916)
Income tax (provision) benefit	0	0
Net income	(92,546)	(121,916)
Net (income) loss attributable to non-controlling interests	0	0
Net income (loss) attributable to Starwood Property Trust, Inc.	(92,546)	(121,916)
Corporate | Primary Beneficiary
Other income (loss):
Income from affordable housing fund investments	0	0
Securitization VIEs
Revenues:
Interest income from loans	0	0
Interest income from investment securities	(39,996)	(34,481)
Servicing fees	(4,434)	(3,478)
Rental income	0	0
Other revenues	0	0
Total revenues	(44,430)	(37,959)
Costs and expenses:
Management fees	0	0
Interest expense	(195)	(210)
General and administrative	0	0
Costs of rental operations	0	0
Depreciation and amortization	0	0
Credit loss (reversal) provision, net	0	0
Other expense	0	0
Total costs and expenses	(195)	(210)
Other income (loss):
Change in net assets related to consolidated VIEs	28,691	10,086
Change in fair value of servicing rights	867	3,609
Change in fair value of investment securities, net	15,059	24,364
Change in fair value of mortgage loans, net	0	0
Earnings from unconsolidated entities	(382)	(310)
(Loss) gain on sale of investments and other assets, net		0
(Loss) gain on derivative financial instruments, net	0	0
Foreign currency gain (loss), net	0	0
Loss on extinguishment of debt		0
Other (loss) income, net	0	0
Total other income (loss)	44,235	37,749
Income (loss) before income taxes	0	0
Income tax (provision) benefit	0	0
Net income	0	0
Net (income) loss attributable to non-controlling interests	0	0
Net income (loss) attributable to Starwood Property Trust, Inc.	0	0
Securitization VIEs | Primary Beneficiary
Other income (loss):
Income from affordable housing fund investments	$ 0	$ 0