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Derivative Financial Instruments (Details 5) - U.S. Treasury and Federal agencies securities - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreements $ 122,300 $ 148,220
Up to 30 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreements 1,310 1,320
Greater than 90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreements $ 300 $ 300