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Mortgage Loans on Real Estate (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
loans
Quarters
portfolio_segment
Dec. 31, 2012
loans
Mortgage Loans on Real Estate [Abstract]    
Mortgage loans on real estate $ 2,581,082,000 $ 2,623,940,000
Commitments outstanding 79,600,000  
Number of portfolio segments that make up financing receivables 1  
Number of days past due, delinquent status 60 days  
Number of quarters of data utilized to calculate loss rates in determining the general allowance for loan losses 4  
Debt service coverage ratio (less than amount) 100.00%  
Number of loans satisfied by foreclosure 5 13
Number of days past due, non-accrual status 90 days  
Outstanding principal of non-accrual loans $ 8,200,000 $ 34,700,000
Impaired mortgage loans, workout terms, interest only payments, six month terms 6 months  
Impaired mortgage loans, workout terms, interest only payments, twelve month terms 12 months  
Impaired mortgage loans, workout terms, cash flow sweep, number of months 12 months