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Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 loans | Dec. 31, 2012 loans
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | 18 | 24
Principal balance outstanding | $ 45,653 | $ 68,050
Specific loan loss allowance | (6,653) | (10,969)
Net carrying amount | 39,000 | 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 | 22,140 | 28,786
Specific loan loss allowance | (329) | (1,702)
Net carrying amount | 21,811 | 27,084
South Atlantic [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | 7 | 9
Principal balance outstanding | 13,930 | 23,358
Specific loan loss allowance | (4,177) | (5,047)
Net carrying amount | 9,753 | 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 | (475) | (2,328)
Net carrying amount | 1,463 | 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 Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 65 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7484272&loc=SL7484277-172609 + Details
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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=28368275&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables 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=28368275&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables 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=28368275&loc=SL6953676-111524 + Details
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