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Mortgage Loans on Real Estate (Narrative) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
portfolio_segment
loans
Mar. 31, 2015
loans
Dec. 31, 2015
USD ($)
Mortgage Loans on Real Estate [Abstract]      
Commitments outstanding $ 31.7    
Number of portfolio segments that make up financing receivables | portfolio_segment 1    
Number of mortgage loans satisfied by foreclosure | loans 0 0  
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    
Number of days past due, non-accrual status 90 days    
Outstanding principal of loans in a non-accrual status $ 6.4   $ 0.0
Minimum [Member]      
Mortgage Loans on Real Estate [Line Items]      
Number of days past due, delinquent status 60 days