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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, 2017 | Dec. 31, 2016
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 2,562,449 | $ 2,490,619
Percent | 100.00% | 100.00%
East [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 596,587 | $ 635,434
Percent | 23.30% | 25.50%
Middle Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 155,234 | $ 151,640
Percent | 6.10% | 6.10%
Mountain [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 302,764 | $ 235,932
Percent | 11.80% | 9.50%
New England [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 12,496 | $ 12,724
Percent | 0.50% | 0.50%
Pacific [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 423,086 | $ 385,683
Percent | 16.50% | 15.50%
South Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 542,146 | $ 519,065
Percent | 21.20% | 20.80%
West North Central [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 311,126 | $ 325,447
Percent | 12.10% | 13.10%
West South Central [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 219,010 | $ 224,694
Percent | 8.50% | 9.00%
Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 291,118 | $ 308,578
Percent | 11.40% | 12.40%
Medical Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 35,248 | $ 50,780
Percent | 1.40% | 2.10%
Retail [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 989,810 | $ 886,942
Percent | 38.60% | 35.60%
Industrial/Warehouse [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 691,630 | $ 700,644
Percent | 27.00% | 28.10%
Apartment [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 377,170 | $ 375,837
Percent | 14.70% | 15.10%
Mixed Use/Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 177,473 | $ 167,838
Percent | 6.90% | 6.70%

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5066-111524 + Details
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