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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Allocation of Carrying Value of Loan Portfolio Based on Internal Risk Ratings (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 67 | 72
Total | $ 6,535,079 | $ 6,375,093
% of Portfolio | 100.00% | 100.00%
Year 1 | $ 469,586 | $ 2,736,825
Year 2 | 2,661,017 | 1,596,690
Year 3 | 1,398,479 | 912,636
Year 4 | 999,564 | 291,700
Year 5 | 204,129 | 524,246
Prior | 802,304 | 312,996
General CECL Allowance | (38,102) |
Total carrying value, net | $ 6,496,977 | $ 6,375,093
Weighted Average Risk Rating | 3.1 | 3.0
1 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 0 | 0
Total | $ 0 | $ 0
% of Portfolio | 0.00% | 0.00%
Year 1 | $ 0 | $ 0
Year 2 | 0 | 0
Year 3 | 0 | 0
Year 4 | 0 | 0
Year 5 | 0 | 0
Prior | $ 0 | $ 0
2 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 1 | 8
Total | $ 32,000 | $ 348,324
% of Portfolio | 0.50% | 5.50%
Year 1 | $ 0 | $ 0
Year 2 | 0 | 241,676
Year 3 | 0 | 0
Year 4 | 0 | 36,250
Year 5 | 0 | 24,546
Prior | $ 32,000 | $ 45,852
3 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 62 | 61
Total | $ 6,129,541 | $ 5,707,555
% of Portfolio | 93.80% | 89.50%
Year 1 | $ 469,586 | $ 2,736,825
Year 2 | 2,661,017 | 1,355,014
Year 3 | 1,398,479 | 912,636
Year 4 | 868,514 | 72,540
Year 5 | 88,710 | 499,700
Prior | $ 643,235 | $ 130,840
4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 0 | 1
Total | $ 0 | $ 182,910
% of Portfolio | 0.00% | 2.90%
Year 1 | $ 0 | $ 0
Year 2 | 0 | 0
Year 3 | 0 | 0
Year 4 | 0 | 182,910
Year 5 | 0 | 0
Prior | $ 0 | $ 0
5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 4 | 2
Total | $ 373,538 | $ 136,304
% of Portfolio | 5.70% | 2.10%
Year 1 | $ 0 | $ 0
Year 2 | 0 | 0
Year 3 | 0 | 0
Year 4 | 131,050 | 0
Year 5 | 115,419 | 0
Prior | $ 127,069 | $ 136,304

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