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Mortgage Loans on Real Estate (Commercial Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivable | $ 21,100 | $ 16,600
Commercial Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 3,325,371 | $ 3,580,154
Percent | 100.00% | 100.00%
Commercial Mortgage Loans | East |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 672,882 | $ 699,741
Percent | 20.20% | 19.50%
Commercial Mortgage Loans | Middle Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 292,152 | $ 281,971
Percent | 8.80% | 7.90%
Commercial Mortgage Loans | Mountain |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 349,747 | $ 391,025
Percent | 10.50% | 10.90%
Commercial Mortgage Loans | New England |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 24,325 | $ 24,774
Percent | 0.70% | 0.70%
Commercial Mortgage Loans | Pacific |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 634,074 | $ 659,743
Percent | 19.10% | 18.40%
Commercial Mortgage Loans | South Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 746,152 | $ 832,739
Percent | 22.50% | 23.30%
Commercial Mortgage Loans | West North Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 243,396 | $ 266,050
Percent | 7.30% | 7.40%
Commercial Mortgage Loans | West South Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 362,643 | $ 424,111
Percent | 10.90% | 11.90%
Commercial Mortgage Loans | Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 290,702 | $ 297,065
Percent | 8.70% | 8.30%
Commercial Mortgage Loans | Medical Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 15,752 | $ 20,584
Percent | 0.50% | 0.60%
Commercial Mortgage Loans | Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 1,062,830 | $ 1,187,484
Percent | 32.00% | 33.20%
Commercial Mortgage Loans | Industrial/Warehouse |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 902,412 | $ 929,325
Percent | 27.10% | 25.90%
Commercial Mortgage Loans | Apartment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 885,655 | $ 939,084
Percent | 26.60% | 26.20%
Commercial Mortgage Loans | Mixed Use/Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 168,020 | $ 206,612
Percent | 5.10% | 5.80%
Agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 354,743 | $ 245,807
Residential Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 610,635 | $ 366,320

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