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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Loan Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Total carrying value, net |  | $ 7,857,260 | $ 6,496,977
Commercial Mortgage and Subordinated Portfolio Segment |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Total carrying value, net |  | 97,800 | 136,100
Commercial Mortgage Portfolio Segment |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Total carrying value, net | [1],[2] | 7,012,312 | 5,451,084
Subordinate Mortgage Portfolio Segment |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Total carrying value, net | [2] | $ 844,948 | $ 1,045,893
[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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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