Revenue from Contracts with Customers (Disaggregation of Revenue by Source) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 42,797	$ 40,834	$ 124,908	$ 120,281
Brokerage and insurance product commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,563	4,686	13,991	13,966
Trust
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,179	4,399	13,718	14,366
Asset management
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	16,215	14,914	45,825	43,783
Wealth management
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	24,957	23,999	73,534	72,115
Mortgage broker fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	85	235	312	608
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	11,497	9,972	33,182	28,097
Administrative services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,077	1,086	3,122	3,125
Card related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,021	2,220	5,506	6,932
Other deposit related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 3,160	$ 3,322	$ 9,252	$ 9,404