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Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) loans	Dec. 31, 2015 USD ($) loans
Financing Receivable, Modifications [Line Items]
Number of TDRs | loans	6	9
Principal balance outstanding	$ 12,044	$ 20,374
Specific loan loss allowance	(3,459)	(3,459)
Net carrying amount	$ 8,585	$ 16,915
South Atlantic [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs | loans	5	6
Principal balance outstanding	$ 9,963	$ 11,155
Specific loan loss allowance	(2,992)	(2,992)
Net carrying amount	$ 6,971	$ 8,163
East North Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs | loans	1	2
Principal balance outstanding	$ 2,081	$ 3,306
Specific loan loss allowance	(467)	(467)
Net carrying amount	$ 1,614	$ 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

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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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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