Number of securities.

No definition available.

Name:	stwd_NumberOfSecurities
Namespace Prefix:	stwd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481444/860-30-45-2

+ Details

Name:	us-gaap_CollateralizedFinancings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_CollateralizedFinancingsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482949/835-30-55-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Secured Borrowings - Collateralized Loan Obligations (Details) $ in Thousands		1 Months Ended			6 Months Ended	12 Months Ended
	Feb. 28, 2026	Jul. 31, 2026 USD ($)	Mar. 31, 2026 USD ($)	Jan. 31, 2026 USD ($)	Jun. 30, 2026 USD ($) Item security	Dec. 31, 2025 USD ($) security Item
Summary of CLO
Carrying Value					$ 4,811,511	$ 5,131,453
Collateral assets
Summary of CLO
Face amount					4,180,797	4,538,474
Carrying Value					6,412,229	6,739,635
Financing
Summary of CLO
Face amount					4,839,145	5,153,316
Carrying Value					4,811,511	5,131,453
CLOs and SASB \| Collateral assets
Summary of CLO
Face amount					4,180,797	4,538,474
Carrying Value					4,401,646	4,811,701
CLOs and SASB \| Financing
Summary of CLO
Face amount					3,429,814	3,884,988
Carrying Value					$ 3,413,912	$ 3,869,775
STWD 2025-FL4 \| Collateral assets
Summary of CLO
Count \| Item					27	21
Face amount					$ 1,103,850	$ 1,049,200
Carrying Value					$ 1,108,010	$ 1,108,352
Weighted Average Rate					3.08%	3.19%
STWD 2025-FL4 \| Financing
Summary of CLO
Count \| Item					1	1
Face amount					$ 968,628	$ 968,628
Carrying Value					$ 962,087	$ 961,078
Weighted Average Rate					1.85%	1.85%
STWD 2022-FL3 \| Subsequent Event
Summary of CLO
Repayments of debt		$ 299,200
STWD 2022-FL3 \| Collateral assets
Summary of CLO
Count \| security					16	23
Face amount					$ 458,576	$ 662,525
Carrying Value					$ 460,493	$ 668,530
Weighted Average Rate					2.96%	2.99%
STWD 2022-FL3 \| Financing
Summary of CLO
Count \| security					1	1
Face amount					$ 299,196	$ 505,973
Carrying Value					$ 299,196	$ 505,973
Weighted Average Rate					2.13%	1.82%
STWD 2021-HTS \| Collateral assets
Summary of CLO
Count \| security					1	1
Face amount					$ 82,603	$ 102,602
Carrying Value					$ 82,982	$ 103,101
Weighted Average Rate					3.97%	3.97%
STWD 2021-HTS \| Financing
Summary of CLO
Count \| security					1	1
Face amount					$ 62,694	$ 82,693
Carrying Value					$ 62,694	$ 82,693
Weighted Average Rate					3.92%	3.80%
STWD 2021-FL2 \| Subsequent Event
Summary of CLO
Repayments of debt		$ 279,900
STWD 2021-FL2 \| Collateral assets
Summary of CLO
Count \| security					11	18
Face amount					$ 498,443	$ 886,773
Carrying Value					$ 501,172	$ 896,979
Weighted Average Rate					3.34%	3.22%
STWD 2021-FL2 \| Financing
Summary of CLO
Count \| security					1	1
Face amount					$ 279,896	$ 674,494
Carrying Value					$ 279,896	$ 674,494
Weighted Average Rate					2.31%	1.77%
Starwood 2026-SIF7 \| Collateral assets
Summary of CLO
Count \| Item					34
Face amount					$ 563,619
Carrying Value					$ 619,563
Weighted Average Rate					3.57%
Starwood 2026-SIF7 \| Financing
Summary of CLO
Count \| Item					1
Face amount					$ 496,200
Carrying Value					$ 493,257
Weighted Average Rate					1.91%
Percentage of debt earning fixed-rate interest					3.00%
Weighted average interest rate					7.33%
Starwood 2025-SIF6 \| Collateral assets
Summary of CLO
Count \| Item					34	27
Face amount					$ 454,335	$ 487,404
Carrying Value					$ 509,053	$ 503,199
Weighted Average Rate					3.69%	3.75%
Starwood 2025-SIF6 \| Financing
Summary of CLO
Count \| Item					1	1
Face amount					$ 413,500	$ 413,500
Carrying Value					$ 411,182	$ 410,792
Weighted Average Rate					1.91%	1.91%
Percentage of debt earning fixed-rate interest					6.00%
Weighted average interest rate					7.26%
Starwood 2025-SIF5 \| Collateral assets
Summary of CLO
Count					32	29
Face amount					$ 451,797	$ 444,427
Carrying Value					$ 509,239	$ 510,441
Weighted Average Rate					3.55%	3.64%
Starwood 2025-SIF5 \| Financing
Summary of CLO
Count					1	1
Face amount					$ 413,500	$ 413,500
Carrying Value					$ 411,368	$ 410,945
Weighted Average Rate					1.94%	1.94%
Percentage of debt earning fixed-rate interest					6.00%
Weighted average interest rate					7.33%
Starwood 2024-SIF4 \| Collateral assets
Summary of CLO
Count \| security					31	27
Face amount					$ 567,574	$ 551,333
Carrying Value					$ 611,134	$ 612,505
Weighted Average Rate					3.51%	3.69%
Starwood 2024-SIF4 \| Financing
Summary of CLO
Count \| security					1	1
Face amount					$ 496,200	$ 496,200
Carrying Value					$ 494,232	$ 493,800
Weighted Average Rate					2.10%	2.10%
Percentage of debt earning fixed-rate interest					5.00%
Weighted average interest rate					7.33%
STWD 2024-SIF3
Summary of CLO
Repayments of debt				$ 330,000
STWD 2024-SIF3 \| Collateral assets
Summary of CLO
Count \| security						27
Face amount						$ 354,210
Carrying Value						$ 408,594
Weighted Average Rate						3.78%
STWD 2024-SIF3 \| Financing
Summary of CLO
Count \| security						1
Face amount						$ 330,000
Carrying Value						$ 330,000
Weighted Average Rate						2.41%
ABS Financing \| Collateral assets
Summary of CLO
Count \| security					444	433
Carrying Value					$ 2,010,583	$ 1,927,934
ABS Financing \| Financing
Summary of CLO
Count \| security					4	4
Face amount					$ 1,409,331	$ 1,268,328
Carrying Value					$ 1,397,599	$ 1,261,678
Weighted Average Rate	5.73%		5.29%		5.29%	5.73%
ABS, FI Series 2026-1
Summary of CLO
Weighted average interest rate			5.06%
ABS, FI Series 2026-1 \| Financing
Summary of CLO
Face amount					$ 466,100
Weighted average interest rate					5.06%
ABS, FI Series 2025-1 \| Financing
Summary of CLO
Face amount					$ 390,400	$ 390,900
Weighted average interest rate					5.25%	5.26%
ABS, FI Seriess 2024-1 \| Financing
Summary of CLO
Face amount					$ 240,000	$ 240,300
Weighted average interest rate					5.03%	5.03%
ABS, FI Series 2023-2 \| Financing
Summary of CLO
Face amount					$ 312,800	$ 313,200
Weighted average interest rate					5.89%	5.89%
ABS, FI Series 2023-1
Summary of CLO
Weighted average interest rate			6.65%
Repayments of debt			$ 323,600
ABS, FI Series 2023-1 \| Financing
Summary of CLO
Face amount						$ 323,900
Weighted average interest rate						6.65%