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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Loan Portfolio (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Commercial mortgage loan, held for sale | [1] | $ 135,465 | $ 0
Carrying value, net |  | 8,285,890 | 8,358,093
Commercial Mortgage and Subordinated Portfolio Segment |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Mortgage loans on real estate, commercial and consumer, net |  | 83,500 | 95,500
Commercial Mortgage Portfolio Segment |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Commercial mortgage loan, held for sale |  | 135,465 | 0
Mortgage loans on real estate, commercial and consumer, net | [2],[3] | 7,846,460 | 7,925,359
Subordinate Mortgage Portfolio Segment |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Mortgage loans on real estate, commercial and consumer, net | [3],[4] | $ 303,965 | $ 432,734
[1] | Includes $135,465 pledged as collateral under secured debt arrangements in 2024.
[2] | Includes $7,642,848 and $7,705,491 pledged as collateral under secured debt arrangements in 2024 and 2023, respectively.
[3] | Net of $367,558 and $219,482 CECL Allowances comprised of $335,000 and $193,000 Specific CECL Allowance and $32,558 and $26,482 General CECL Allowance in 2024 and 2023, respectively.
[4] | Includes $246,725 and $232,991 pledged as collateral under secured debt arrangements in 2024 and 2023, 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 Amount, before valuation allowance, of financing receivable classified as held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481852/948-310-45-1 + 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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