Revenue Recognition In-Scope and Out-of-Scope Revenue Streams (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Trust income	$ 2,325	$ 2,206	$ 6,221	$ 6,014
Service charges on deposit accounts	4,954	4,589	13,792	13,418
Insurance and retail brokerage commissions	1,912	1,872	5,887	5,560
Card-related interchange income	5,629	5,044	15,800	14,929
Derivatives mark to market	(45)	0	(88)	789
Gain on sale of other loans and assets	970	643	3,831	3,548
Other income	1,865	1,754	5,356	5,125
Noninterest Income	22,179	19,757	62,957	68,108
In-Scope of Topic 606 [Member]
Trust income			6,221	6,014
Service charges on deposit accounts			13,792	13,418
Insurance and retail brokerage commissions			5,887	5,560
Card-related interchange income			15,800	14,929
Gain on sale of other loans and assets	181	335	861	726
Other income	937	928	2,789	2,800
Noninterest Income	15,938	14,974	45,350	43,447
Out-Of-Scope of Topic 606 [Member]
Noninterest Income	$ 6,241	$ 4,783	$ 17,607	$ 24,661