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Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) loans	Dec. 31, 2014 USD ($) loans
Financing Receivable, Modifications [Line Items]
Number of TDRs | loans	10	9
Principal balance outstanding	$ 22,013	$ 18,533
Specific loan loss allowance	(4,505)	(5,758)
Net carrying amount	$ 17,508	$ 12,775
South Atlantic [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs | loans	6	7
Principal balance outstanding	$ 10,878	$ 14,475
Specific loan loss allowance	(2,992)	(4,244)
Net carrying amount	$ 7,886	$ 10,231
East North Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs | loans	2	1
Principal balance outstanding	$ 3,345	$ 2,177
Specific loan loss allowance	(467)	(467)
Net carrying amount	$ 2,878	$ 1,710
West North Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs | loans	2	1
Principal balance outstanding	$ 7,790	$ 1,881
Specific loan loss allowance	(1,046)	(1,047)
Net carrying amount	$ 6,744	$ 834

X

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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.

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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



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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



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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



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