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Securities (Details 6) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Trading Securities [Abstract]    
Trading securities, at estimated fair value $ 0 $ 7,368
Obligations of U.S. Government sponsored entities    
Trading Securities [Abstract]    
Trading securities, at estimated fair value 0 6,601
U.S. Government sponsored entities    
Trading Securities [Abstract]    
Trading securities, at estimated fair value $ 0 $ 767