Condensed Consolidated Statements of Income - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017
Interest and fees on loans and leases:
Taxable		$ 43,066	$ 37,153		$ 121,653		$ 105,955
Exempt from federal income taxes		2,501	2,106		7,269		6,225
Total interest and fees on loans and leases		45,567	39,259		128,922		112,180
Interest and dividends on investment securities:
Taxable		2,348	1,855		6,805		5,376
Exempt from federal income taxes		459	550		1,404		1,725
Interest on deposits with other banks		397	133		621		188
Interest and dividends on other earning assets		484	375		1,497		1,129
Total interest income		49,255	42,172		139,249		120,598
Interest expense
Interest on deposits		6,278	3,068		14,511		7,720
Interest on short-term borrowings		584	169		2,187		756
Interest on long-term debt and subordinated notes		1,970	2,048		5,866		5,652
Total interest expense		8,832	5,285		22,564		14,128
Net interest income	[1]	40,423	36,887		116,685		106,470
Provision for loan and lease losses		2,745	2,689		20,207		7,900
Net interest income after provision for loan and lease losses		37,678	34,198		96,478		98,570
Disaggregation of Revenue [Line Items]
Insurance commission and fee income		3,643	3,492		12,243		11,530
Bank owned life insurance income	[1]	865	742		2,744		3,147
Net gain on sales of investment securities		0	7	[1]	10	[1]	43	[1]
Net gain on mortgage banking activities	[1]	754	908		2,412		3,558
Other income	[2]	116	87		102		712
Total noninterest income		14,861	14,109		45,757		45,088
Noninterest expense
Salaries, benefits and commissions		20,321	19,185		61,033		56,652
Net occupancy		2,515	2,523		7,805		7,872
Equipment		1,042	1,019		3,132		3,043
Data processing		2,339	2,118		6,662		6,257
Professional fees		1,370	1,447		4,056		3,934
Marketing and advertising		461	271		1,368		1,125
Deposit insurance premiums		544	409		1,387		1,262
Intangible expenses		479	690		1,685		1,895
Restructuring charges		0	0		571		0
Other expense		5,300	5,033		16,144		15,233
Total noninterest expense		34,371	32,695		103,843		97,273
Income before income taxes		18,168	15,612		38,392		46,385
Income tax expense		3,204	4,416		6,221		12,555
Net income		$ 14,964	$ 11,196		$ 32,171		$ 33,830
Net income per share:
Basic (in dollars per share)		$ 0.51	$ 0.42		$ 1.10		$ 1.27
Diluted (in dollars per share)		0.51	0.42		1.09		1.27
Dividends declared (in dollars per share)		$ 0.20	$ 0.20		$ 0.60		$ 0.60
Trust fee income
Disaggregation of Revenue [Line Items]
Noninterest income		$ 1,960	$ 1,924		$ 6,000		$ 5,847
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income		1,454	1,371		4,116		3,927
Investment advisory commission and fee income
Disaggregation of Revenue [Line Items]
Noninterest income		3,785	3,455		11,246		9,969
Other service fee income
Disaggregation of Revenue [Line Items]
Noninterest income	[2]	$ 2,284	$ 2,123		$ 6,884		$ 6,355

[1] (1)Net interest income as well as many other revenues for financial assets and liabilities including loans, leases, securities, and derivatives are excluded from the scope of the standard. Noninterest income streams that are out-of-scope of the standard include bank owned life insurance income, sales of investment securities and mortgage banking activities.

[2] (2)Other service fee income and other income include certain items that are in scope and certain items that are out of scope of the standard and are described further in the following paragraphs.