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Commitments And Contingencies (Off-Balance Sheet Commitments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Commitments To Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet commitments $ 701,055 $ 661,021
Standby Letters Of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet commitments $ 12,377 $ 12,181