Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest and fees on loans and leases:
Taxable	$ 47,151	$ 40,637	$ 92,833	$ 78,587
Exempt from federal income taxes	2,759	2,421	5,442	4,768
Total interest and fees on loans and leases	49,910	43,058	98,275	83,355
Interest and dividends on investment securities:
Taxable	2,645	2,268	5,358	4,457
Exempt from federal income taxes	401	477	832	945
Interest on deposits with other banks	569	148	838	224
Interest and dividends on other earning assets	535	509	1,121	1,013
Total interest income	54,060	46,460	106,424	89,994
Interest expense
Interest on deposits	9,111	4,542	17,314	8,233
Interest on short-term borrowings	217	958	855	1,603
Interest on long-term debt and subordinated notes	2,097	1,970	4,097	3,896
Total interest expense	11,425	7,470	22,266	13,732
Net interest income	42,635	38,990	84,158	76,262
Provision for loan and lease losses	2,076	15,409	4,761	17,462
Net interest income after provision for loan and lease losses	40,559	23,581	79,397	58,800
Disaggregation of Revenue [Line Items]
Insurance commission and fee income	3,941	3,712	9,085	8,600
Bank owned life insurance income	743	1,210	1,695	1,879
Net gain on sales of investment securities	7	0	8	10
Net gain on mortgage banking activities	796	942	1,279	1,658
Other income (loss)	723	(138)	1,062	(14)
Total noninterest income	16,356	15,314	32,653	30,896
Noninterest expense
Salaries, benefits and commissions	22,089	20,065	43,653	40,712
Net occupancy	2,601	2,533	5,212	5,290
Equipment	1,065	1,067	2,055	2,090
Data processing	2,627	2,091	5,141	4,323
Professional fees	1,307	1,331	2,571	2,686
Marketing and advertising	622	526	938	907
Deposit insurance premiums	430	452	882	843
Intangible expenses	417	594	843	1,206
Restructuring charges	0	0	0	571
Other expense	5,620	5,688	11,040	10,844
Total noninterest expense	36,778	34,347	72,335	69,472
Income before income taxes	20,137	4,548	39,715	20,224
Income tax expense	3,669	191	7,168	3,017
Net income	$ 16,468	$ 4,357	$ 32,547	$ 17,207
Net income per share:
Basic (in dollars per share)	$ 0.56	$ 0.15	$ 1.11	$ 0.59
Diluted (in dollars per share)	$ 0.56	$ 0.15	$ 1.11	$ 0.58
Trust fee income
Disaggregation of Revenue [Line Items]
Noninterest income	$ 2,054	$ 2,044	$ 3,941	$ 4,040
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income	1,447	1,335	2,882	2,662
Investment advisory commission and fee income
Disaggregation of Revenue [Line Items]
Noninterest income	4,055	3,778	7,844	7,461
Other service fee income
Disaggregation of Revenue [Line Items]
Noninterest income	$ 2,590	$ 2,431	$ 4,857	$ 4,600