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Mortgage Loans on Real Estate (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
loans
portfolio_segment
Mar. 31, 2013
loans
Dec. 31, 2013
Mortgage Loans on Real Estate [Abstract]      
Mortgage loans on real estate $ 2,584,583,000   $ 2,581,082,000
Commitments outstanding 54,300,000    
Number of portfolio segments that make up financing receivables 1    
Number of days past due, delinquent status 60 days    
Number of mortgage loans satisfied by foreclosure 1 1  
Number of days past due, non-accrual status 90 days    
Outstanding principal of loans in a non-accrual status $ 11,200,000   $ 8,200,000
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