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Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 loans | Dec. 31, 2012 loans
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | 17 | 24
Principal balance outstanding | $ 41,889 | $ 68,050
Specific loan loss allowance | 5,617 | 10,969
Net carrying amount | 36,272 | 57,081
East [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | 1 | 1
Principal balance outstanding | 3,712 | 4,208
Specific loan loss allowance | 949 | 1,425
Net carrying amount | 2,763 | 2,783
Mountain [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | 7 | 10
Principal balance outstanding | 21,514 | 28,786
Specific loan loss allowance | 631 | 1,702
Net carrying amount | 20,883 | 27,084
South Atlantic [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | 6 | 9
Principal balance outstanding | 10,792 | 23,358
Specific loan loss allowance | 3,314 | 5,047
Net carrying amount | 7,478 | 18,311
East North Central [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | 1 | 1
Principal balance outstanding | 2,219 | 2,232
Specific loan loss allowance | 467 | 467
Net carrying amount | 1,752 | 1,765
West North Central [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | 1 | 3
Principal balance outstanding | 1,938 | 9,466
Specific loan loss allowance | 0 | 2,328
Net carrying amount | 1,938 | 7,138
West South Central [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | 1 |
Principal balance outstanding | 1,714 |
Specific loan loss allowance | 256 |
Net carrying amount | $ 1,458 |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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- Definition Amount of investment in financing receivables (after modification) modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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- Definition Amount of investment in financing receivables (before modification) modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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