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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Statistics for Loan Portfolio (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) loan | Mar. 31, 2020 USD ($) loan | Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans | loan | 67 | 75 | 67
Principal balance | $ 6,856,509 | $ 6,488,891 | $ 6,535,079
Commercial mortgage loans, net | 6,820,074 | $ 6,430,618 | 6,496,977
Unfunded loan commitments | $ 1,402,474 |  | $ 1,399,989
Weighted-average cash coupon | 5.60% |  | 5.70%
Weighted-average remaining fully-extended term | 2 years 9 months 18 days |  | 2 years 9 months 18 days
Weighted-average expected term | 2 years 1 month 6 days |  | 2 years 1 month 6 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 | $ 7,051,148 |  | $ 6,728,424

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