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Mortgage Loans on Real Estate (Real Estate Owned) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2017
Mortgage Loans on Real Estate [Abstract]      
Real estate owned at beginning of period $ 0 $ 6,485  
Real estate acquired in satisfaction of mortgage loans 0 0  
Additions 0 0  
Sales 0 (6,444)  
Impairments 0 0  
Depreciation 0 (41)  
Real estate owned at end of period 0 0  
Real estate owned at end of period $ 0 $ 6,485 $ 0