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Mortgage Loans on Real Estate (Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Commercial Mortgage and Residential Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivable | $ 15,500 |
Residential Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | 153,913 | $ 0
Commercial Mortgage Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 3,828,972 | $ 3,458,914
Percent | 100.00% | 100.00%
Commercial Mortgage Loans | East |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 714,198 | $ 645,991
Percent | 18.70% | 18.70%
Commercial Mortgage Loans | Middle Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 287,864 | $ 284,597
Percent | 7.50% | 8.20%
Commercial Mortgage Loans | Mountain |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 444,495 | $ 389,892
Percent | 11.60% | 11.30%
Commercial Mortgage Loans | New England |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 25,066 | $ 9,152
Percent | 0.70% | 0.30%
Commercial Mortgage Loans | Pacific |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 782,240 | $ 655,518
Percent | 20.40% | 19.00%
Commercial Mortgage Loans | South Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 820,260 | $ 751,199
Percent | 21.40% | 21.70%
Commercial Mortgage Loans | West North Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 308,874 | $ 302,534
Percent | 8.10% | 8.70%
Commercial Mortgage Loans | West South Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 445,975 | $ 420,031
Percent | 11.60% | 12.10%
Commercial Mortgage Loans | Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 259,888 | $ 250,287
Percent | 6.80% | 7.30%
Commercial Mortgage Loans | Medical Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 27,372 | $ 29,990
Percent | 0.70% | 0.90%
Commercial Mortgage Loans | Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 1,225,212 | $ 1,225,670
Percent | 32.00% | 35.40%
Commercial Mortgage Loans | Industrial/Warehouse |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 974,579 | $ 896,558
Percent | 25.50% | 25.90%
Commercial Mortgage Loans | Apartment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 971,536 | $ 858,679
Percent | 25.40% | 24.80%
Commercial Mortgage Loans | Agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 177,333 | $ 51,303
Percent | 4.60% | 1.50%
Commercial Mortgage Loans | Mixed Use/Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 193,052 | $ 146,427
Percent | 5.00% | 4.20%

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