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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Statistics for Loan Portfolio (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loans | loan | 67 | 67
Principal balance | $ 8,371,419 | $ 7,890,848
Commercial mortgage loans, net | 8,350,042 | 7,857,260
Unfunded loan commitments | $ 1,800,235 | $ 1,357,122
Weighted-average cash coupon | 4.50% | 4.50%
Weighted-average remaining fully-extended term | 3 years | 2 years 10 months 24 days
Weighted-average expected term | 2 years | 2 years 3 months 18 days
Interest rate used in calculating weighted-average cash coupon for non-accrual or cost recovery loans | 0.00% | 0.00%
Principal balance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal balance | $ 8,594,654 | $ 8,072,377

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