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Borrowings Securities Sold under Agreement to Repurchase (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]    
Securities Sold under Agreements to Repurchase $ 185,763 $ 128,842
U.S. Treasury securities and obligations of U.S. government corporations & agencies    
Short-term Debt [Line Items]    
Securities Sold under Agreements to Repurchase 100,526 85,805
US States and Political Subdivisions Debt Securities [Member]    
Short-term Debt [Line Items]    
Securities Sold under Agreements to Repurchase 1,173 0
Mortgage-backed securities    
Short-term Debt [Line Items]    
Securities Sold under Agreements to Repurchase $ 84,064 $ 43,037