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Mortgage Loans on Real Estate (Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 2,470,456 | $ 2,457,721
Percent | 100.00% | 100.00%
Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 417,122 | $ 484,585
Percent | 16.90% | 19.70%
Medical Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 84,843 | $ 88,275
Percent | 3.40% | 3.60%
Retail [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 768,210 | $ 711,775
Percent | 31.10% | 29.00%
Industrial/Warehouse [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 688,336 | $ 649,425
Percent | 27.90% | 26.40%
Hotel [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 3,412 | $ 30,640
Percent | 0.10% | 1.30%
Apartment [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 362,809 | $ 335,087
Percent | 14.70% | 13.60%
Mixed Use/Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 145,724 | $ 157,934
Percent | 5.90% | 6.40%
East [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 720,522 | $ 701,638
Percent | 29.20% | 28.50%
Middle Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 160,946 | $ 166,249
Percent | 6.50% | 6.80%
Mountain [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 255,454 | $ 279,075
Percent | 10.30% | 11.40%
New England [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 13,267 | $ 12,280
Percent | 0.50% | 0.50%
Pacific [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 359,231 | $ 302,307
Percent | 14.60% | 12.30%
South Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 451,123 | $ 471,849
Percent | 18.30% | 19.20%
West North Central [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 311,774 | $ 349,028
Percent | 12.60% | 14.20%
West South Central [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 198,139 | $ 175,295
Percent | 8.00% | 7.10%

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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=35738203&loc=d3e5066-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 + Details
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