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Derivative Financial Instruments (Details 5) - U.S. Treasury and Federal agencies securities - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreements $ 168,040 $ 128,880
Up to 30 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreements 1,480 1,780
Greater than 90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreements $ 300 $ 0