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