Revenue from Contracts with Customers (Disaggregation of Revenue by Source) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 161,465	$ 152,513	$ 138,994
Wealth management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	97,114	90,963	81,766
Brokerage and insurance product commissions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18,825	22,391	22,863
Trust
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18,767	13,263	12,547
Asset management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	59,522	55,309	46,356
Mortgage broker fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	768	1,188	1,565
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	39,070	36,404	34,513
Administrative services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,197	4,625	4,165
Card related fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,816	7,441	5,858
Other deposit related fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 12,500	$ 11,892	$ 11,127