CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Loans and leases	$ 234,455	$ 194,726	$ 175,999
Investment securities, taxable	19,356	13,853	11,914
Investment securities, tax-exempt	1,857	2,413	2,603
Other	1,648	1,393	1,244
Total interest income	257,316	212,385	191,760
Interest expense:
Deposits	34,631	19,202	15,267
Short-term borrowings	2,838	1,115	525
Subordinated notes	3,625	4,002	4,220
Long-term debt and mandatorily redeemable securities	2,316	2,435	2,089
Total interest expense	43,410	26,754	22,101
Net interest income	213,906	185,631	169,659
Provision for loan and lease losses	19,462	8,980	5,833
Net interest income after provision for loan and lease losses	194,444	176,651	163,826
Noninterest income:
Mortgage banking	3,844	4,796	4,496
Insurance commissions	6,502	5,889	5,513
Equipment rental	31,793	30,381	25,863
(Losses) gains on investment securities available-for-sale	(345)
(Losses) gains on investment securities available-for-sale (including equity securities)		4,340	1,796
Other	10,362	9,922	11,122
Total noninterest income	97,050	98,706	88,945
Noninterest expense:
Salaries and employee benefits	93,857	86,912	86,837
Net occupancy	10,041	10,624	9,686
Furniture and equipment	23,433	20,769	19,500
Depreciation — leased equipment	26,248	25,215	21,678
Professional fees	7,680	6,810	5,161
Supplies and communication	6,320	5,355	5,244
FDIC and other insurance	2,923	2,537	3,147
Business development and marketing	6,112	7,477	4,936
Loan and lease collection and repossession	3,375	2,724	1,600
Other	6,478	5,574	5,856
Total noninterest expense	186,467	173,997	163,645
Income before income taxes	105,027	101,360	89,126
Income tax expense	22,613	33,309	31,340
Net income	82,414	68,051	57,786
Net (income) loss attributable to noncontrolling interests	0	0	0
Net income available to common shareholders	$ 82,414	$ 68,051	$ 57,786
Basic net income per common share, in dollars per share	$ 3.16	$ 2.60	$ 2.22
Diluted net income per common share, in dollars per share	$ 3.16	$ 2.60	$ 2.22
Trust and wealth advisory
Noninterest income:
Trust and wealth advisory, service charges on deposit accounts, and debit card income	$ 21,071	$ 20,980	$ 19,256
Service charges on deposit accounts
Noninterest income:
Trust and wealth advisory, service charges on deposit accounts, and debit card income	10,454	10,589	10,012
Debit card
Noninterest income:
Trust and wealth advisory, service charges on deposit accounts, and debit card income	$ 13,369	$ 11,809	$ 10,887