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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Loan Portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Total carrying value, net |  | $ 7,974,031 | $ 8,681,990
Commercial Mortgage and Subordinated Portfolio Segment |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Total carrying value, net |  | 102,600 | 138,300
Commercial Mortgage Portfolio Segment |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Total carrying value, net | [1],[2] | 7,561,254 | 8,121,109
Subordinate Mortgage Portfolio Segment |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Total carrying value, net | [2],[3] | $ 412,777 | $ 560,881
[1] | Includes $7,203,350 and $7,482,658 pledged as collateral under secured debt arrangements in 2023 and 2022, respectively.
[2] | Net of $220,305 and $159,724 CECL Allowance in 2023 and 2022, respectively, comprised of $193,000 and $133,500 Specific CECL Allowance and $27,305 and $26,224 General CECL Allowance, respectively.
[3] | Includes $213,139 and $191,608 pledged as collateral under secured debt arrangements in 2023 and 2022, 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC + 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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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