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Mortgage Loans on Real Estate Mortgage Loans by Credit Quality Indicator (Details) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
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Financing Receivable, Recorded Investment [Line Items] |  |
Notes, Loans and Financing Receivable, Gross | $ 2,600,000,000 |
Financing Receivable, by Credit Quality Indicator [Domain] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Mortgage Loans on Real Estate Performing | 2,578,031,000 | 2,597,440,000
Mortgage Loans on Real Estate In Workout | 28,326,000 | 26,723,000
Mortgage Loans on Real Estate Collateral Dependent | 19,380,000 | 34,720,000
Notes, Loans and Financing Receivable, Gross | 2,625,737,000 | 2,658,883,000
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 19,400,000 | 34,700,000
Notes, Loans and Financing Receivable, Gross | $ 2,625,737,000 | $ 2,658,883,000

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- Definition Mortgage loans on real estate at the reporting date that are not performing and will probably be satisfied by taking ownership of the real estate serving as collateral. + References No definition available. + Details
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- Definition Mortgage loans that are in a workout period at the end of the reporting period. Workouts are payment periods that are not in compliance with original loan agreement, such as interest only periods, no debt service payment periods, or escrowing principal portion of payments to be used for capital improvements. + References No definition available. + Details
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- Definition Mortgage loans that are in compliance with contractual terms at end of period. + References No definition available. + Details
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- Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524 + 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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