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Commercial Mortgage Loans, 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, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 67 | 67
Total | $ 7,890,848 | $ 6,535,079
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 100.00% | 100.00%
Year 1 | $ 2,622,248 | $ 469,586
Year 2 | 644,404 | 2,661,017
Year 3 | 2,307,948 | 1,398,479
Year 4 | 828,270 | 999,564
Year 5 | 648,727 | 204,129
Prior | 839,251 | 802,304
General CECL Allowance | (33,588) | (38,102)
Total carrying value, net | $ 7,857,260 | $ 6,496,977
Weighted Average Risk Rating | 3.1 | 3.1
1 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 0 | 0
Total | $ 0 | $ 0
Mortgage loans on real estate, commercial and consumer, percentage 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 | 1
Total | $ 32,000 | $ 32,000
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 0.40% | 0.50%
Year 1 | $ 0 | $ 0
Year 2 | 0 | 0
Year 3 | 0 | 0
Year 4 | 0 | 0
Year 5 | 0 | 0
Prior | $ 32,000 | $ 32,000
3 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 62 | 62
Total | $ 7,372,081 | $ 6,129,541
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 93.50% | 93.80%
Year 1 | $ 2,622,248 | $ 469,586
Year 2 | 644,404 | 2,661,017
Year 3 | 2,307,948 | 1,398,479
Year 4 | 828,270 | 868,514
Year 5 | 389,264 | 88,710
Prior | $ 579,947 | $ 643,235
4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 1 | 0
Total | $ 81,980 | $ 0
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 1.00% | 0.00%
Year 1 | $ 0 | $ 0
Year 2 | 0 | 0
Year 3 | 0 | 0
Year 4 | 0 | 0
Year 5 | 81,980 | 0
Prior | $ 0 | $ 0
5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 3 | 4
Total | $ 404,787 | $ 373,538
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 5.10% | 5.70%
Year 1 | $ 0 | $ 0
Year 2 | 0 | 0
Year 3 | 0 | 0
Year 4 | 0 | 131,050
Year 5 | 177,483 | 115,419
Prior | $ 227,304 | $ 127,069

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