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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, 2020 | Dec. 31, 2019
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Commercial Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 3,580,154 | $ 3,407,611
Percent | 100.00% | 100.00%
Commercial Mortgage Loans | East |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 699,741 | $ 645,991
Percent | 19.50% | 19.00%
Commercial Mortgage Loans | Middle Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 281,971 | $ 284,597
Percent | 7.90% | 8.40%
Commercial Mortgage Loans | Mountain |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 391,025 | $ 389,892
Percent | 10.90% | 11.40%
Commercial Mortgage Loans | New England |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 24,774 | $ 9,152
Percent | 0.70% | 0.30%
Commercial Mortgage Loans | Pacific |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 659,743 | $ 618,336
Percent | 18.40% | 18.10%
Commercial Mortgage Loans | South Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 832,739 | $ 751,199
Percent | 23.30% | 22.00%
Commercial Mortgage Loans | West North Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 266,050 | $ 288,413
Percent | 7.40% | 8.50%
Commercial Mortgage Loans | West South Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 424,111 | $ 420,031
Percent | 11.90% | 12.30%
Commercial Mortgage Loans | Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 297,065 | $ 250,287
Percent | 8.30% | 7.30%
Commercial Mortgage Loans | Medical Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 20,584 | $ 29,990
Percent | 0.60% | 0.90%
Commercial Mortgage Loans | Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 1,187,484 | $ 1,225,670
Percent | 33.20% | 36.00%
Commercial Mortgage Loans | Industrial/Warehouse |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 929,325 | $ 896,558
Percent | 25.90% | 26.30%
Commercial Mortgage Loans | Apartment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 939,084 | $ 858,679
Percent | 26.20% | 25.20%
Commercial Mortgage Loans | Mixed Use/Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 206,612 | $ 146,427
Percent | 5.80% | 4.30%
Agricultural Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 245,807 | $ 51,303
Residential Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | 366,320 | $ 0
Commercial Mortgage Loans, Agricultural Mortgage Loans and Residential Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivable | $ 16,600 |

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