Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest and fees on loans and leases:
Taxable	$ 45,682	$ 37,950
Exempt from federal income taxes	2,683	2,347
Total interest and fees on loans and leases	48,365	40,297
Interest and dividends on investment securities:
Taxable	2,713	2,189
Exempt from federal income taxes	431	468
Interest on deposits with other banks	269	76
Interest and dividends on other earning assets	586	504
Total interest income	52,364	43,534
Interest expense
Interest on deposits	8,203	3,691
Interest on short-term borrowings	638	645
Interest on long-term debt and subordinated notes	2,000	1,926
Total interest expense	10,841	6,262
Net interest income	41,523	37,272
Provision for loan and lease losses	2,685	2,053
Net interest income after provision for loan and lease losses	38,838	35,219
Disaggregation of Revenue [Line Items]
Insurance commission and fee income	5,144	4,888
Bank owned life insurance income	952	669
Net gain on sales of investment securities	1	10
Net gain on mortgage banking activities	483	716
Other income	339	124
Total noninterest income	16,297	15,582
Noninterest expense
Salaries, benefits and commissions	21,564	20,647
Net occupancy	2,611	2,757
Equipment	990	1,023
Data processing	2,514	2,232
Professional fees	1,264	1,355
Marketing and advertising	316	381
Deposit insurance premiums	452	391
Intangible expenses	426	612
Restructuring charges	0	571
Other expense	5,420	5,156
Total noninterest expense	35,557	35,125
Income before income taxes	19,578	15,676
Income tax expense	3,499	2,826
Net income	$ 16,079	$ 12,850
Net income per share:
Basic (in dollars per share)	$ 0.55	$ 0.44
Diluted (in dollars per share)	0.55	0.44
Dividends declared (in dollars per share)	$ 0.20	$ 0.20
Trust fee income
Disaggregation of Revenue [Line Items]
Noninterest income	$ 1,887	$ 1,996
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income	1,435	1,327
Investment advisory commission and fee income
Disaggregation of Revenue [Line Items]
Noninterest income	3,789	3,683
Other service fee income
Disaggregation of Revenue [Line Items]
Noninterest income	$ 2,267	$ 2,169