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Commitments and Contingencies (Off-Balance Sheet Commitments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Commitments To Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet commitments $ 529,694 $ 514,818
Standby Letters Of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet commitments $ 12,474 $ 11,746