Revenue from Contracts with Customers (Disaggregation by Timing of Revenue Recognition) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue from contracts in scope of Topic 606	$ 11,514	$ 11,741	$ 34,728	$ 35,822
Wealth Management Revenues
Revenue from contracts in scope of Topic 606	9,153	9,454	27,954	29,329
Wealth Management Revenues | Transferred over Time [Member]
Revenue from contracts in scope of Topic 606	9,153	9,454	27,954	29,329
Card Interchange Fees
Revenue from contracts in scope of Topic 606	1,099	983	3,114	2,791
Card Interchange Fees | Transferred at Point in Time [Member]
Revenue from contracts in scope of Topic 606	1,099	983	3,114	2,791
Service Charges on Deposit Accounts
Revenue from contracts in scope of Topic 606	939	885	2,743	2,651
Service Charges on Deposit Accounts | Transferred at Point in Time [Member]
Revenue from contracts in scope of Topic 606	728	670	2,109	2,045
Service Charges on Deposit Accounts | Transferred over Time [Member]
Revenue from contracts in scope of Topic 606	211	215	634	606
Other Income
Revenue from contracts in scope of Topic 606	323	419	917	1,051
Other Income | Transferred at Point in Time [Member]
Revenue from contracts in scope of Topic 606	268	258	771	732
Other Income | Transferred over Time [Member]
Revenue from contracts in scope of Topic 606	$ 55	$ 161	$ 146	$ 319