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Mortgage Loans on Real Estate (Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - Commercial Real Estate Portfolio Segment - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 3,689,302 | $ 3,458,914
Percent | 100.00% | 100.00%
Accrued interest receivable | $ 12,800 |
East |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 705,459 | $ 645,991
Percent | 19.10% | 18.70%
Middle Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 290,232 | $ 284,597
Percent | 7.90% | 8.20%
Mountain |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 393,338 | $ 389,892
Percent | 10.70% | 11.30%
New England |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 11,284 | $ 9,152
Percent | 0.30% | 0.30%
Pacific |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 730,262 | $ 655,518
Percent | 19.80% | 19.00%
South Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 809,663 | $ 751,199
Percent | 21.90% | 21.70%
West North Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 304,069 | $ 302,534
Percent | 8.20% | 8.70%
West South Central |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 444,995 | $ 420,031
Percent | 12.10% | 12.10%
Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 262,446 | $ 250,287
Percent | 7.10% | 7.30%
Medical Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 29,551 | $ 29,990
Percent | 0.80% | 0.90%
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 1,222,985 | $ 1,225,670
Percent | 33.20% | 35.40%
Industrial/Warehouse |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 938,104 | $ 896,558
Percent | 25.40% | 25.90%
Apartment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 956,947 | $ 858,679
Percent | 25.90% | 24.80%
Agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 95,606 | $ 51,303
Percent | 2.60% | 1.50%
Mixed Use/Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Principal outstanding | $ 183,663 | $ 146,427
Percent | 5.00% | 4.20%

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