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Mortgage Loans on Real Estate (Real Estate Owned) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Mortgage Loans on Real Estate [Abstract]      
Real estate owned $ 6,485 $ 20,238 $ 0
Real estate owned at beginning of period 6,485 20,238  
Additions 0 121  
Sales (6,444) (12,322)  
Impairments 0 (1,297)  
Depreciation (41) (255)  
Real estate owned at end of period $ 0 $ 6,485