Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014 loans	Dec. 31, 2013 loans
Financing Receivable, Modifications [Line Items]
Number of TDRs	9	18
Principal balance outstanding	$ 18,658	$ 45,653
Specific loan loss allowance	(4,852)	(6,653)
Net carrying amount	13,806	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	14,537	13,930
Specific loan loss allowance	(3,911)	(4,177)
Net carrying amount	10,626	9,753
East North Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs	1	1
Principal balance outstanding	2,213	2,219
Specific loan loss allowance	(467)	(467)
Net carrying amount	1,746	1,752
West North Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs	1	1
Principal balance outstanding	1,908	1,938
Specific loan loss allowance	(474)	(475)
Net carrying amount	1,434	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