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Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) $ in Thousands	12 Months Ended
	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

X

- 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.

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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

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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
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

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- Definition

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

+ References

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-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

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