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Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014 loans	Dec. 31, 2013 loans
Financing Receivable, Modifications [Line Items]
Number of TDRs	12	18
Principal balance outstanding	$ 27,566	$ 45,653
Specific loan loss allowance	(6,267)	(6,653)
Net carrying amount	21,299	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	2	7
Principal balance outstanding	7,871	22,140
Specific loan loss allowance	(893)	(329)
Net carrying amount	6,978	21,811
South Atlantic [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs	7	7
Principal balance outstanding	13,841	13,930
Specific loan loss allowance	(4,177)	(4,177)
Net carrying amount	9,664	9,753
East North Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs	1	1
Principal balance outstanding	2,219	2,219
Specific loan loss allowance	(467)	(467)
Net carrying amount	1,752	1,752
West North Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs	1	1
Principal balance outstanding	1,921	1,938
Specific loan loss allowance	(475)	(475)
Net carrying amount	1,446	1,463
West South Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs	1	1
Principal balance outstanding	1,714	1,714
Specific loan loss allowance	(255)	(256)
Net carrying amount	$ 1,459	$ 1,458

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 65

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7484272&loc=SL7484277-172609

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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=28368275&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- 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=28368275&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Pre-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=28368275&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration