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Mortgage Loans on Real Estate Schedule of Mortgage Loan Portfolio by Geographic Region and Property Type (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,600,000 | $ 2,800,000
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,658,883 | 2,856,011
Percent of Mortgage Loans | 100.00% | 100.00%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans Office Property Type [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 666,467 | 777,343
Percent of Mortgage Loans | 25.10% | 27.20%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans Medical Office Property Type [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 136,764 | 175,580
Percent of Mortgage Loans | 5.10% | 6.10%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans Retail Property Type [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 677,951 | 635,916
Percent of Mortgage Loans | 25.50% | 22.30%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans Industrial and Warehouse Property Type [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 692,637 | 710,426
Percent of Mortgage Loans | 26.10% | 24.90%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans Hotel Property Type [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 94,045 | 139,193
Percent of Mortgage Loans | 3.50% | 4.90%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans Apartment Property Type [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 219,335 | 187,548
Percent of Mortgage Loans | 8.20% | 6.60%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans Mixed Use or Other Property Type [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 171,684 | 230,005
Percent of Mortgage Loans | 6.50% | 8.00%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans East United States Region [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 732,762 | 719,231
Percent of Mortgage Loans | 27.50% | 25.20%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans Middle Atlantic United States Region [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 155,094 | 169,240
Percent of Mortgage Loans | 5.80% | 5.90%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans Mountain United States Region [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 387,599 | 411,054
Percent of Mortgage Loans | 14.60% | 14.40%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans New England United States Region [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 26,385 | 36,815
Percent of Mortgage Loans | 1.00% | 1.30%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans Pacific United States Region [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 320,982 | 309,693
Percent of Mortgage Loans | 12.10% | 10.80%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans South Atlantic United States Region [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 458,802 | 493,764
Percent of Mortgage Loans | 17.30% | 17.30%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans West North Central United States Region [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 370,168 | 487,693
Percent of Mortgage Loans | 13.90% | 17.10%
Commercial Real Estate Portfolio Segment [Member] | Mortgage Loans West South Central United States Region [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 207,091 | $ 228,521
Percent of Mortgage Loans | 7.80% | 8.00%

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 2: 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 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=7512638&loc=d3e5066-111524 Reference 4: 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 5: 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 6: 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 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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