Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
INTEREST REVENUE:
Loans and leases	$ 440,677	$ 419,813	$ 404,559
Deposits with other banks	1,070	438	532
Available-for-sale securities:
Taxable	25,191	26,308	27,755
Tax-exempt	11,625	13,075	14,462
Loans held for sale	4,616	4,744	2,949
Total interest revenue	483,179	464,378	450,257
Deposits:
Interest bearing demand	9,246	8,820	7,851
Savings	1,826	1,703	1,614
Other time	14,162	14,837	20,675
Federal funds purchased and securities sold under agreement to repurchase	662	383	331
Long-term debt	3,082	2,285	2,463
Junior subordinated debt	747	667	659
Other	2	1	2
Total interest expense	29,727	28,696	33,595
Net interest revenue	453,452	435,682	416,662
Provision for credit losses	4,000	(13,000)
Net interest revenue, after provision for credit losses	449,452	448,682	416,662
NONINTEREST REVENUE:
Mortgage lending	41,735	35,530	22,671
Credit card, debit card and merchant fees	37,010	36,533	35,303
Deposit service charges	43,301	46,765	50,622
Security gains, net	128	136	37
Insurance commissions	115,955	116,744	114,842
Wealth management	21,169	22,660	23,940
Other	19,732	19,600	21,731
Total noninterest revenue	279,030	277,968	269,146
NONINTEREST EXPENSE:
Salaries and employee benefits	328,217	322,469	307,828
Occupancy, net of rental income	41,088	41,866	41,345
Equipment	14,046	15,309	16,869
Deposit insurance assessments	9,915	9,509	8,190
Regulatory settlement	10,277
Other	128,495	150,758	144,174
Total noninterest expense	532,038	539,911	518,406
Income before income taxes	196,444	186,739	167,402
Income tax expense	63,716	59,248	50,652
Net Income	$ 132,728	$ 127,491	$ 116,750
Earnings per share: Basic (in dollars per share)	$ 1.41	$ 1.33	$ 1.22
Earnings per share: Diluted (in dollars per share)	$ 1.41	$ 1.33	$ 1.21