Revenue from Contract with Customers (Disaggregation by Timing of Revenue Recognition) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Wealth management revenues	$ 38,341	$ 39,346	$ 37,569
Card interchange fees	3,768	3,502	3,385
Service charges on deposit accounts	3,628	3,672	3,702
Other income	1,339	1,522	1,388
Total revenues from contracts in scope of Topic 606	194,404	184,340	175,607
Revenue from Contract with Customer [Member]
Wealth management revenues	38,341	39,346	37,569
Card interchange fees	3,768	3,502	3,385
Service charges on deposit accounts	3,628	3,672	3,702
Other income	1,329	1,469	1,388
Total revenues from contracts in scope of Topic 606	47,066	47,989	46,044
Revenue from Contract with Customer [Member] | Transferred at Point in Time [Member]
Card interchange fees	3,768	3,502	3,385
Service charges on deposit accounts	2,802	2,899	2,914
Other income	958	1,122	1,062
Revenue from Contract with Customer [Member] | Transferred over Time [Member]
Wealth management revenues	38,341	39,346	37,569
Service charges on deposit accounts	826	773	788
Other income	$ 371	$ 347	$ 326