Commitments (Summarized credit-related financial instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies [Abstract]
Commitments To Extend Credit	$ 485,019	$ 492,885
Commercial letters credit	494	2,721
Standby letters of credit and financial guarantees	21,107	4,041
Loans sold with recourse	$ 6,420	$ 20,126