Off-Balance-Sheet Arrangements, Commitments, Guarantees And Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies [Abstract]
Commitments to extend commercial and real estate mortgage credit	$ 429,383	$ 446,412
Standby and commercial letters of credit	7,160	6,595
Total	436,543	$ 453,007
Maximum amount payable for Severance Compensation Plan	$ 12,100