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Mortgage Loans on Real Estate (Commercial Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Commercial Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 3,560,903 | $ 3,633,131
Percent | 100.00% | 100.00%
Commercial Mortgage Loans | East |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 502,659 | $ 614,406
Percent | 14.10% | 16.90%
Commercial Mortgage Loans | Middle Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 280,993 | $ 293,494
Percent | 7.90% | 8.10%
Commercial Mortgage Loans | Mountain |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 416,307 | $ 452,818
Percent | 11.70% | 12.50%
Commercial Mortgage Loans | New England |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 73,631 | $ 60,172
Percent | 2.10% | 1.60%
Commercial Mortgage Loans | Pacific |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 858,812 | $ 863,879
Percent | 24.10% | 23.80%
Commercial Mortgage Loans | South Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 934,007 | $ 785,679
Percent | 26.20% | 21.60%
Commercial Mortgage Loans | West North Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 205,568 | $ 235,864
Percent | 5.80% | 6.50%
Commercial Mortgage Loans | West South Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 288,926 | $ 326,819
Percent | 8.10% | 9.00%
Commercial Mortgage Loans | Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 378,713 | $ 315,374
Percent | 10.60% | 8.70%
Commercial Mortgage Loans | Medical Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 10,265 | $ 10,827
Percent | 0.30% | 0.30%
Commercial Mortgage Loans | Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 896,351 | $ 1,016,101
Percent | 25.20% | 28.00%
Commercial Mortgage Loans | Industrial/Warehouse |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 866,623 | $ 924,779
Percent | 24.30% | 25.40%
Commercial Mortgage Loans | Apartment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 912,984 | $ 864,580
Percent | 25.60% | 23.80%
Commercial Mortgage Loans | Hotel |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 285,271 | $ 283,500
Percent | 8.00% | 7.80%
Commercial Mortgage Loans | Mixed Use/Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 210,696 | $ 217,970
Percent | 6.00% | 6.00%
Agricultural Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 567,630 | $ 408,135
Residential Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 2,807,652 | $ 1,652,910

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