Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net interest income	$ 33,449	$ 30,059	$ 98,412	$ 88,642
Asset-based wealth management revenues	9,322	9,791	28,413	28,439
Transaction-based wealth management revenues	132	222	916	993
Wealth management revenues	9,454	10,013	29,329	29,432
Mortgage banking revenues	2,624	3,036	8,403	8,295
Service charges on deposit accounts	885	942	2,651	2,726
Card interchange fees	983	894	2,791	2,598
Income from bank-owned life insurance	572	546	1,624	1,624
Loan related derivative income	278	1,452	1,087	2,744
Other income	419	400	1,066	1,180
Total noninterest income	15,215	17,283	46,951	48,599
Total revenues	48,664	47,342	145,363	137,241
Revenue from Contracts with Customers [Member]
Net interest income	0	0	0	0
Asset-based wealth management revenues	9,322	9,791	28,413	28,439
Transaction-based wealth management revenues	132	222	916	993
Wealth management revenues	9,454	10,013	29,329	29,432
Mortgage banking revenues	0	0	0	0
Service charges on deposit accounts	885	942	2,651	2,726
Card interchange fees	983	894	2,791	2,598
Income from bank-owned life insurance	0	0	0	0
Loan related derivative income	0	0	0	0
Other income	419	400	1,051	1,139
Total noninterest income	11,741	12,249	35,822	35,895
Total revenues	$ 11,741	$ 12,249	$ 35,822	$ 35,895