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Mortgage Loans on Real Estate (Real Estate Owned) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2017
Mortgage Loans on Real Estate [Abstract]    
Real estate owned at beginning of period $ 6,485  
Real estate acquired in satisfaction of mortgage loans 0  
Additions 0  
Sales (1,106)  
Impairments 0  
Depreciation (23)  
Real estate owned at end of period 5,356  
Real estate owned at end of period $ 6,485 $ 0