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Mortgage Loans on Real Estate (Commercial Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - Commercial Mortgage Loans - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 3,535,506 | $ 3,560,903
Percent | 100.00% | 100.00%
East |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 484,451 | $ 502,659
Percent | 13.70% | 14.10%
Middle Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 278,727 | $ 280,993
Percent | 7.90% | 7.90%
Mountain |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 397,667 | $ 416,307
Percent | 11.20% | 11.70%
New England |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 77,457 | $ 73,631
Percent | 2.20% | 2.10%
Pacific |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 844,371 | $ 858,812
Percent | 23.90% | 24.10%
South Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 943,302 | $ 934,007
Percent | 26.70% | 26.20%
West North Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 197,206 | $ 205,568
Percent | 5.60% | 5.80%
West South Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 312,325 | $ 288,926
Percent | 8.80% | 8.10%
Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 366,086 | $ 388,978
Percent | 10.30% | 10.90%
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 845,217 | $ 896,351
Percent | 23.90% | 25.20%
Industrial/Warehouse |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 896,797 | $ 866,623
Percent | 25.40% | 24.30%
Apartment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 1,024,893 | $ 912,984
Percent | 29.00% | 25.60%
Hotel |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 324,271 | $ 285,271
Percent | 9.20% | 8.00%
Mixed Use/Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 78,242 | $ 210,696
Percent | 2.20% | 6.00%

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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481598/310-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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