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Secured Debt Arrangements, Net - Schedule of Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 343,106 |  |  |  | $ 325,498 |  |  |  |
Commercial mortgage loans, net |  | 7,857,260 |  |  |  | 6,496,977 |  |  |  |
Other assets |  | 47,753 |  |  |  | 74,640 |  |  |  |
Total Assets |  | 8,416,695 |  |  |  | 6,940,020 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |
Total Liabilities |  | 6,122,069 |  |  |  | 4,669,491 |  |  |  |
Allowance reserve |  | 33,588 |  |  |  | 38,102 |  |  |  |
Off-balance sheet, credit loss, liability |  | 3,106 | $ 2,193 | $ 2,444 | $ 3,794 | 3,365 | $ 3,595 | $ 4,119 | $ 6,059 | $ 0
Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |
Commercial mortgage loans, net | [1],[2] | 7,012,312 |  |  |  | 5,451,084 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |
Allowance reserve |  | 22,554 |  |  |  | 17,012 |  |  |  |
VIE |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 3,456 |  |  |  | 2,020 |  |  |  |
Commercial mortgage loans, net |  | 2,559,266 |  |  |  | 1,290,393 |  |  |  |
Other assets |  | 20,765 |  |  |  | 15,831 |  |  |  |
Total Assets |  | 2,583,487 |  |  |  | 1,308,244 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |
Secured debt arrangements, net (net of deferred financing costs of $2.0 million and $0.7 million in 2021 and 2020, respectively) |  | 1,900,640 |  |  |  | 857,043 |  |  |  |
Accounts payable, accrued expenses and other liabilities |  | 2,671 |  |  |  | 1,307 |  |  |  |
Total Liabilities |  | 1,903,311 |  |  |  | 858,350 |  |  |  |
Deferred financing costs |  | 2,000 |  |  |  | 700 |  |  |  |
VIE | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |
Allowance reserve |  | 11,800 |  |  |  | 4,400 |  |  |  |
Off-balance sheet, credit loss, liability |  | $ 400 |  |  |  | $ 300 |  |  |  |
[1] | Includes $5,957,707 and $5,418,999 pledged as collateral under secured debt arrangements in 2021 and 2020, respectively.
[2] | Net of $178,588 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $145,000 a nd $175,000 Specific CECL Allowance and $33,588 and $38,102 General CECL Allowance, respectively.

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