Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest and fees on loans and leases:
Taxable	$ 143,176	$ 110,119	$ 86,792
Exempt from federal income taxes	8,442	7,545	6,452
Total interest and fees on loans and leases	151,618	117,664	93,244
Interest and dividends on investment securities:
Taxable	7,343	5,380	4,671
Exempt from federal income taxes	2,274	2,712	3,447
Interest on deposits with other banks	280	61	95
Interest and dividends on other earning assets	1,500	790	526
Total interest income	163,015	126,607	101,983
Interest expense
Interest on demand deposits	3,917	1,902	1,474
Interest on savings deposits	2,089	1,052	533
Interest on time deposits	5,271	4,261	4,000
Interest on short-term borrowings	904	748	35
Interest on long-term debt and subordinated notes	7,658	4,419	2,023
Total interest expense	19,839	12,382	8,065
Net interest income	143,176	114,225	93,918
Provision for loan and lease losses	9,892	4,821	3,802
Net interest income after provision for loan and lease losses	133,284	109,404	90,116
Noninterest income
Trust fee income	8,055	7,741	7,908
Service charges on deposit accounts	5,482	4,691	4,230
Investment advisory commission and fee income	13,454	11,424	10,817
Insurance commission and fee income	14,788	14,603	13,885
Other service fee income	8,656	7,836	7,335
Bank owned life insurance income	3,988	2,931	1,295
Net gain on sales of investment securities	48	518	1,265
Net gain on mortgage banking activities	4,023	6,027	4,838
Other income	746	192	852
Total noninterest income	59,240	55,963	52,425
Noninterest expense
Salaries, benefits and commissions	75,908	70,879	58,106
Net occupancy	10,433	9,638	8,430
Equipment	4,118	3,489	3,159
Data processing	8,500	6,981	4,660
Professional fees	5,325	4,547	3,839
Marketing and advertising	1,485	2,015	2,253
Deposit insurance premiums	1,636	1,713	1,730
Intangible expenses	2,582	5,528	2,567
Acquisition-related costs	0	10,257	1,047
Integration costs	0	5,667	1,490
Restructuring charges	0	1,731	1,642
Other expense	20,726	19,536	16,592
Total noninterest expense	130,713	141,981	105,515
Income before income taxes	61,811	23,386	37,026
Income taxes	17,717	3,881	9,758
Net income	$ 44,094	$ 19,505	$ 27,268
Net income per share:
Basic (in dollars per share)	$ 1.64	$ 0.85	$ 1.39
Diluted (in dollars per share)	1.64	0.84	1.39
Dividends declared	$ 0.80	$ 0.80	$ 0.80