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Borrowings Securities Sold under Agreement to Repurchase (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Securities Sold under Agreements to Repurchase $ 128,842 $ 121,869
U.S. Treasury securities and obligations of U.S. government corporations & agencies    
Short-term Debt [Line Items]    
Securities Sold under Agreements to Repurchase 85,805  
Mortgage-backed securities    
Short-term Debt [Line Items]    
Securities Sold under Agreements to Repurchase $ 43,037