Condensed Consolidated Statements of Income - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017
Interest and fees on loans and leases:
Taxable		$ 40,637	$ 35,102		$ 78,587		$ 68,802
Exempt from federal income taxes		2,421	2,084		4,768		4,119
Total interest and fees on loans and leases		43,058	37,186		83,355		72,921
Interest and dividends on investment securities:
Taxable		2,268	1,833		4,457		3,521
Exempt from federal income taxes		477	576		945		1,175
Interest on deposits with other banks		148	38		224		55
Interest and dividends on other earning assets		509	397		1,013		754
Total interest income		46,460	40,030		89,994		78,426
Interest expense
Interest on deposits		4,542	2,461		8,233		4,652
Interest on short-term borrowings		958	325		1,603		587
Interest on long-term debt and subordinated notes		1,970	1,944		3,896		3,604
Total interest expense		7,470	4,730		13,732		8,843
Net interest income	[1]	38,990	35,300		76,262		69,583
Provision for loan and lease losses		15,409	2,766		17,462		5,211
Net interest income after provision for loan and lease losses		23,581	32,534		58,800		64,372
Disaggregation of Revenue [Line Items]
Insurance commission and fee income		3,712	3,628		8,600		8,038
Bank owned life insurance income	[1]	1,210	1,622		1,879		2,405
Net gain on sales of investment securities		0	21	[1]	10	[1]	36	[1]
Net gain on mortgage banking activities	[1]	942	1,537		1,658		2,650
Other (loss) income	[2]	(138)	294		(14)		625
Total noninterest income		15,314	16,009		30,896		30,979
Noninterest expense
Salaries, benefits and commissions		20,065	18,730		40,712		37,467
Net occupancy		2,533	2,684		5,290		5,349
Equipment		1,067	1,031		2,090		2,024
Data processing		2,091	2,081		4,323		4,139
Professional fees		1,331	1,248		2,686		2,487
Marketing and advertising		526	475		907		854
Deposit insurance premiums		452	451		843		853
Intangible expenses		594	446		1,206		1,205
Restructuring charges		0	0		571		0
Other expense		5,688	5,402		10,844		10,200
Total noninterest expense		34,347	32,548		69,472		64,578
Income before income taxes		4,548	15,995		20,224		30,773
Income tax expense		191	4,217		3,017		8,139
Net income		$ 4,357	$ 11,778		$ 17,207		$ 22,634
Net income per share:
Basic (in dollars per share)		$ 0.15	$ 0.44		$ 0.59		$ 0.85
Diluted (in dollars per share)		0.15	0.44		0.58		0.85
Dividends declared (in dollars per share)		$ 0.20	$ 0.20		$ 0.40		$ 0.40
Trust fee income
Disaggregation of Revenue [Line Items]
Noninterest income		$ 2,044	$ 2,016		$ 4,040		$ 3,923
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income		1,335	1,313		2,662		2,556
Investment advisory commission and fee income
Disaggregation of Revenue [Line Items]
Noninterest income		3,778	3,333		7,461		6,514
Other service fee income
Disaggregation of Revenue [Line Items]
Noninterest income	[2]	$ 2,431	$ 2,245		$ 4,600		$ 4,232

[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.