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Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) loans | Dec. 31, 2015 USD ($) loans
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | loans | 2 | 9
Principal balance outstanding | $ 5,024 | $ 20,374
Specific loan loss allowance | (467) | (3,459)
Net carrying amount | $ 4,557 | $ 16,915
South Atlantic [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | loans | 1 | 6
Principal balance outstanding | $ 3,004 | $ 11,155
Specific loan loss allowance | 0 | (2,992)
Net carrying amount | $ 3,004 | $ 8,163
East North Central [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | loans | 1 | 2
Principal balance outstanding | $ 2,020 | $ 3,306
Specific loan loss allowance | (467) | (467)
Net carrying amount | $ 1,553 | $ 2,839
West North Central [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | loans |  | 1
Principal balance outstanding |  | $ 5,913
Specific loan loss allowance |  | 0
Net carrying amount |  | $ 5,913

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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=66008989&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=66008989&loc=SL6953676-111524 + Details
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