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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 [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 2,625,563 | $ 2,658,883
Percent | 100.00% | 100.00%
Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 613,050 | 666,467
Percent | 23.40% | 25.10%
Medical Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 131,304 | 136,764
Percent | 5.00% | 5.10%
Retail [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 698,189 | 677,951
Percent | 26.60% | 25.50%
Industrial/Warehouse [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 664,703 | 692,637
Percent | 25.30% | 26.10%
Hotel [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 79,385 | 94,045
Percent | 3.00% | 3.50%
Apartment [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 269,817 | 219,335
Percent | 10.30% | 8.20%
Mixed Use/Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 169,115 | 171,684
Percent | 6.40% | 6.50%
East [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 772,366 | 732,762
Percent | 29.40% | 27.50%
Middle Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 149,951 | 155,094
Percent | 5.70% | 5.80%
Mountain [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 353,820 | 387,599
Percent | 13.50% | 14.60%
New England [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 22,790 | 26,385
Percent | 0.90% | 1.00%
Pacific [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 316,822 | 320,982
Percent | 12.10% | 12.10%
South Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 491,221 | 458,802
Percent | 18.70% | 17.30%
West North Central [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | 358,115 | 370,168
Percent | 13.60% | 13.90%
West South Central [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Principal outstanding | $ 160,478 | $ 207,091
Percent | 6.10% | 7.80%

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- Definition Represents the specific geographic distribution or property type distribution amount as a percentabe of the total amortzed cost of mortgage loans. + References No definition available. + Details
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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 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 Reference 5: 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 6: 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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 51, 52, 53 -IssueDate 2006-05-01 -Chapter 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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