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Commitments And Contingencies (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Standby letters of credit    
Other Commitments [Line Items]    
Contractual obligations $ 7,151 $ 5,014
Commercial letters of credit    
Other Commitments [Line Items]    
Contractual obligations 831 1,859
Home equity lines | Commitments to extend credit:    
Other Commitments [Line Items]    
Contractual obligations 194,477 185,553
Commercial real estate | Commitments to extend credit:    
Other Commitments [Line Items]    
Contractual obligations 66,901 98,883
Other commitments | Commitments to extend credit:    
Other Commitments [Line Items]    
Contractual obligations $ 184,895 $ 203,103