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Mortgage Loans on Real Estate (Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 2,952,464 | $ 2,674,315 | $ 2,490,619
Percent | 100.00% | 100.00% |
East |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 586,773 | $ 548,067 |
Percent | 19.90% | 20.50% |
Middle Atlantic |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 168,969 | $ 163,485 |
Percent | 5.70% | 6.10% |
Mountain |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 357,642 | $ 308,486 |
Percent | 12.10% | 11.50% |
New England |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 9,418 | $ 12,265 |
Percent | 0.30% | 0.50% |
Pacific |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 521,363 | $ 466,030 |
Percent | 17.70% | 17.40% |
South Atlantic |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 694,599 | $ 609,736 |
Percent | 23.50% | 22.80% |
West North Central |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 291,890 | $ 324,808 |
Percent | 9.90% | 12.20% |
West South Central |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 321,810 | $ 241,438 |
Percent | 10.90% | 9.00% |
Office |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 268,932 | $ 283,926 |
Percent | 9.10% | 10.60% |
Medical Office |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 33,467 | $ 34,338 |
Percent | 1.10% | 1.30% |
Retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 1,091,627 | $ 1,040,028 |
Percent | 37.00% | 38.90% |
Industrial/Warehouse |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 762,887 | $ 677,770 |
Percent | 25.80% | 25.30% |
Apartment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 600,638 | $ 462,897 |
Percent | 20.30% | 17.30% |
Agricultural |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 25,000 | $ 0 |
Percent | 0.90% | 0.00% |
Mixed Use/Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | $ 169,913 | $ 175,356 |
Percent | 5.80% | 6.60% |

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- Definition Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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