Revenue Recognition In-Scope and Out-of-Scope Revenue Streams (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Trust income	$ 1,928	$ 1,417
Service charges on deposit accounts	4,406	4,319
Insurance and retail brokerage commissions	1,868	2,082
Card-related interchange income	4,742	4,251
Derivatives mark to market	789	2
Gain on sale of other loans and assets	574	307
Other income	1,628	1,706
Noninterest Income	22,043	16,932
In-Scope of Topic 606 [Member]
Trust income	1,928	1,417
Service charges on deposit accounts	4,406	4,319
Insurance and retail brokerage commissions	1,868	2,082
Card-related interchange income	4,742	4,251
Gain on sale of other loans and assets	207	190
Other income	892	945
Noninterest Income	14,043	13,204
Out-Of-Scope of Topic 606 [Member]
Noninterest Income	$ 8,000	$ 3,728