Revenue Recognition In-Scope and Out-of-Scope Revenue Streams (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Trust income	$ 1,970	$ 1,880	$ 3,896	$ 3,808
Service charges on deposit accounts	4,593	4,423	8,838	8,829
Insurance and retail brokerage commissions	2,014	1,820	3,975	3,688
Card-related interchange income	5,441	5,143	10,171	9,885
Derivatives mark to market	(17)	0	(43)	789
Gain on sale of other loans and assets	1,777	2,331	2,861	2,905
Other income	1,786	1,743	3,491	3,371
Noninterest Income	21,906	26,308	40,778	48,351
In-Scope of Topic 606 [Member]
Trust income			3,896	3,808
Service charges on deposit accounts			8,838	8,829
Insurance and retail brokerage commissions			3,975	3,688
Card-related interchange income			10,171	9,885
Gain on sale of other loans and assets	422	184	680	391
Other income	990	980	1,853	1,872
Noninterest Income	15,430	14,430	29,413	28,473
Out-Of-Scope of Topic 606 [Member]
Noninterest Income	$ 6,476	$ 11,878	$ 11,365	$ 19,878