Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014 loans	Dec. 31, 2013 loans
Financing Receivable, Modifications [Line Items]
Number of TDRs	9	18
Principal balance outstanding	$ 18,533	$ 45,653
Specific loan loss allowance	(5,758)	(6,653)
Net carrying amount	12,775	39,000
East [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs		1
Principal balance outstanding		3,712
Specific loan loss allowance		(949)
Net carrying amount		2,763
Mountain [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs		7
Principal balance outstanding		22,140
Specific loan loss allowance		(329)
Net carrying amount		21,811
South Atlantic [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs	7	7
Principal balance outstanding	14,475	13,930
Specific loan loss allowance	(4,244)	(4,177)
Net carrying amount	10,231	9,753
East North Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs	1	1
Principal balance outstanding	2,177	2,219
Specific loan loss allowance	(467)	(467)
Net carrying amount	1,710	1,752
West North Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs	1	1
Principal balance outstanding	1,881	1,938
Specific loan loss allowance	(1,047)	(475)
Net carrying amount	834	1,463
West South Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs		1
Principal balance outstanding		1,714
Specific loan loss allowance		(256)
Net carrying amount		$ 1,458

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.

No definition available.

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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=35738203&loc=SL6953676-111524

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

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- Definition

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

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