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Mortgage Loans on Real Estate Mortgage Loans on Real Estate, Troubled Debt Restructurings (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
loans
Dec. 31, 2011
loans
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 24 25
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 76,008 $ 68,641
Allowance for Notes, Loans and Financing Receivable (13,343) (10,360)
Financing Receivable, Modifications, Recorded Investment 62,665 58,281
Troubled Debt Restructurings, East Region [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 1 3
Financing Receivable, Modifications, Pre-Modification Recorded Investment 4,208 8,489
Allowance for Notes, Loans and Financing Receivable (1,425) (2,115)
Financing Receivable, Modifications, Recorded Investment 2,783 6,374
Troubled Debt Restructurings, Mountain Region [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 10 10
Financing Receivable, Modifications, Pre-Modification Recorded Investment 32,222 29,539
Allowance for Notes, Loans and Financing Receivable (2,193) (1,637)
Financing Receivable, Modifications, Recorded Investment 30,029 27,902
Troubled Debt Restructurings, South Atlantic Region [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 7 11
Financing Receivable, Modifications, Pre-Modification Recorded Investment 20,690 28,676
Allowance for Notes, Loans and Financing Receivable (4,309) (6,339)
Financing Receivable, Modifications, Recorded Investment 16,381 22,337
Troubled Debt Restructurings, East North Central Region [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 4  
Financing Receivable, Modifications, Pre-Modification Recorded Investment 11,914  
Allowance for Notes, Loans and Financing Receivable (4,116)  
Financing Receivable, Modifications, Recorded Investment 7,798  
Troubled Debt Restructurings, West North Central Region [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Troubled Debt Restructurings During Period 2 1
Financing Receivable, Modifications, Pre-Modification Recorded Investment 6,974 1,937
Allowance for Notes, Loans and Financing Receivable (1,300) (269)
Financing Receivable, Modifications, Recorded Investment $ 5,674 $ 1,668