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Loan Securitization/Sale Activities - Loans (Details) - Investing and Servicing Segment - Commercial Loans - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Loan Transfer Activities |  |  |
Face Amount | $ 1,201,892 | $ 1,567,244 | $ 759,740
Proceeds | $ 1,241,841 | $ 1,603,167 | $ 770,733

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- References No definition available. + Details
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Namespace Prefix: | stwd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the fair value of loans held-for-sale, sold during the period. + References No definition available. + Details
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Namespace Prefix: | stwd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the par value of loans held-for-sale, sold during the period. + References No definition available. + Details
Name: | stwd_LoansHeldForSaleSoldParValue
Namespace Prefix: | stwd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Data Type: | na
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Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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