Revenue from Contracts with Customers (Disaggregation of Revenue by Source) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 38,456	$ 40,065	$ 82,111	$ 79,447
Brokerage and insurance product commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,147	4,764	9,428	9,280
Trust
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,248	4,640	9,539	9,967
Asset management
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	14,241	14,735	29,610	28,869
Wealth management
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	22,636	24,139	48,577	48,116
Mortgage broker fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	174	191	227	373
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	10,420	9,277	21,685	18,125
Administrative services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	933	1,009	2,045	2,039
Card related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,379	2,156	3,485	4,712
Other deposit related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 2,914	$ 3,293	$ 6,092	$ 6,082