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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Statistics for Loan Portfolio (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loans | loan | 67 | 72
Principal balance | $ 6,535,079 | $ 6,375,093
Commercial mortgage loans, net | 6,496,977 | 6,375,093
Unfunded loan commitments | $ 1,399,989 | $ 1,952,887
Weighted-average cash coupon | 5.70% | 6.50%
Weighted-average remaining fully-extended term | 2 years 9 months 18 days | 3 years 3 months 18 days
Weighted-average expected term | 2 years 1 month 6 days | 1 year 9 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 | $ 6,728,424 | $ 6,467,842

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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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