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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, 2014
Mortgage Loans on Real Estate [Abstract]      
Real estate owned at beginning of period $ 6,485 $ 20,238 $ 22,844
Real estate acquired in satisfaction of mortgage loans 0 0 14,555
Additions 0 121 0
Sales (6,444) (12,322) (14,134)
Impairments 0 (1,297) (2,441)
Depreciation (41) (255) (586)
Real estate owned at end of period $ 0 $ 6,485 $ 20,238