Mortgage Loans on Real Estate (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) portfolio_segment	Dec. 31, 2014 USD ($) loans	Dec. 31, 2013 loans
Mortgage Loans on Real Estate [Abstract]
Commitments outstanding	$ 97.2
Number of portfolio segments that make up financing receivables | portfolio_segment	1
Number of loans satisfied by foreclosure | loans		7	5
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 non-accrual loans	$ 0.0	$ 6.0
Minimum [Member]
Mortgage Loans on Real Estate [Line Items]
Number of days past due, delinquent status	60 days