Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
INTEREST REVENUE:
Loans and leases	$ 111,605	$ 107,086	$ 328,488	$ 312,649
Deposits with other banks	409	36	901	398
Available-for-sale securities:
Taxable	6,189	6,490	18,086	19,758
Tax-exempt	2,898	3,226	8,854	9,938
Loans held for sale	1,239	1,363	3,406	3,585
Total interest revenue	122,340	118,201	359,735	346,328
Deposits:
Interest bearing demand	2,361	2,209	6,732	6,654
Savings	462	431	1,356	1,269
Other time	3,661	3,646	10,451	11,481
Federal funds purchased and securities sold under agreement to repurchase	173	104	472	271
Long-term debt	902	571	2,097	1,704
Junior subordinated debt	190	168	560	496
Other	1	2	2	1
Total interest expense	7,750	7,131	21,670	21,876
Net interest revenue	114,590	111,070	338,065	324,452
Provision for credit losses		(3,000)	3,000	(13,000)
Net interest revenue, after provision for credit losses	114,590	114,070	335,065	337,452
NONINTEREST REVENUE:
Mortgage banking	12,282	2,339	23,943	25,008
Credit card, debit card and merchant fees	9,292	9,282	27,748	27,119
Deposit service charges	11,313	12,150	33,345	34,929
Security gains, net	1	33	89	88
Insurance commissions	28,194	28,584	90,246	91,396
Wealth management	5,312	5,567	15,768	17,285
Other	4,474	4,998	14,927	14,757
Total noninterest revenue	70,868	62,953	206,066	210,582
NONINTEREST EXPENSE:
Salaries and employee benefits	82,079	81,354	246,378	242,292
Occupancy, net of rental income	10,412	10,819	30,794	31,432
Equipment	3,423	3,742	10,483	11,740
Deposit insurance assessments	3,227	2,191	8,097	6,879
Regulatory settlement			10,277
Other	30,371	28,344	94,501	99,217
Total noninterest expense	129,512	126,450	400,530	391,560
Income before income taxes	55,946	50,573	140,601	156,474
Income tax expense	18,129	16,230	45,543	50,152
Net income	$ 37,817	$ 34,343	$ 95,058	$ 106,322
Earnings per share:
Basic (in dollars per share)	$ 0.40	$ 0.36	$ 1.01	$ 1.10
Diluted (in dollars per share)	0.40	0.36	1.00	1.10
Dividends declared per common share (in dollars per share)	$ 0.13	$ 0.10	$ 0.33	$ 0.25