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Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) loans | Dec. 31, 2014 USD ($) loans
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | loans | 9 | 9
Principal balance outstanding | $ 20,374 | $ 18,533
Specific loan loss allowance | (3,459) | (5,758)
Net carrying amount | $ 16,915 | $ 12,775
South Atlantic [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | loans | 6 | 7
Principal balance outstanding | $ 11,155 | $ 14,475
Specific loan loss allowance | (2,992) | (4,244)
Net carrying amount | $ 8,163 | $ 10,231
East North Central [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | loans | 2 | 1
Principal balance outstanding | $ 3,306 | $ 2,177
Specific loan loss allowance | (467) | (467)
Net carrying amount | $ 2,839 | $ 1,710
West North Central [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | loans | 1 | 1
Principal balance outstanding | $ 5,913 | $ 1,881
Specific loan loss allowance | 0 | (1,047)
Net carrying amount | $ 5,913 | $ 834

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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 No definition available. + 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=49124121&loc=SL6953676-111524 + Details
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