Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net interest income	$ 33,111	$ 29,904	$ 64,963	$ 58,583
Asset-based wealth management revenues	9,136	9,401	19,091	18,648
Transaction-based wealth management revenues	466	541	784	771
Wealth management revenues	9,602	9,942	19,875	19,419
Mortgage banking revenues	2,941	2,919	5,779	5,259
Service charges on deposit accounts	903	901	1,766	1,784
Card interchange fees	961	902	1,808	1,704
Income from bank-owned life insurance	537	542	1,052	1,078
Loan related derivative income	668	1,144	809	1,292
Other income	381	456	647	780
Total noninterest income	15,993	16,806	31,736	31,316
Total revenues	49,104	46,710	96,699	89,899
Revenue from Contracts with Customers [Member]
Net interest income	0	0	0	0
Asset-based wealth management revenues	9,136	9,401	19,091	18,648
Transaction-based wealth management revenues	466	541	784	771
Wealth management revenues	9,602	9,942	19,875	19,419
Mortgage banking revenues	0	0	0	0
Service charges on deposit accounts	903	901	1,766	1,784
Card interchange fees	961	902	1,808	1,704
Income from bank-owned life insurance	0	0	0	0
Loan related derivative income	0	0	0	0
Other income	366	442	632	739
Total noninterest income	11,832	12,187	24,081	23,646
Total revenues	$ 11,832	$ 12,187	$ 24,081	$ 23,646