Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
INTEREST REVENUE:
Loans and leases	$ 119,599	$ 111,605	$ 346,383	$ 328,488
Deposits with other banks	214	409	955	901
Available-for-sale securities:
Taxable	7,378	6,189	22,237	18,086
Tax-exempt	2,514	2,898	7,657	8,854
Loans held for sale	1,229	1,239	3,483	3,406
Total interest revenue	130,934	122,340	380,715	359,735
Deposits:
Interest bearing demand	3,482	2,361	9,472	6,732
Savings	494	462	1,449	1,356
Other time	3,819	3,661	11,126	10,451
Federal funds purchased and securities sold under agreement to repurchase	754	173	1,585	472
Long-term debt	1,824	902	4,422	2,097
Junior subordinated debt		190	9	560
Other		1	2	2
Total interest expense	10,373	7,750	28,065	21,670
Net interest revenue	120,561	114,590	352,650	338,065
Provision for credit losses	500		2,500	3,000
Net interest revenue, after provision for credit losses	120,061	114,590	350,150	335,065
NONINTEREST REVENUE:
Mortgage banking	6,909	11,087	22,033	20,803
Credit card, debit card and merchant fees	9,346	9,292	27,814	27,748
Deposit service charges	10,388	11,313	29,783	33,345
Security gains, net	5	1	1,099	89
Insurance commissions	28,616	28,194	92,682	90,246
Wealth management	5,386	5,312	15,835	15,768
Other	5,310	4,474	15,713	14,927
Total noninterest revenue	65,960	69,673	204,959	202,926
NONINTEREST EXPENSE:
Salaries and employee benefits	81,415	80,884	244,398	243,238
Occupancy, net of rental income	10,343	10,412	31,100	30,794
Equipment	3,352	3,423	10,358	10,483
Deposit insurance assessments	2,499	3,227	7,244	8,097
Regulatory settlement				10,277
Other	29,294	30,371	88,465	94,501
Total noninterest expense	126,903	128,317	381,565	397,390
Income before income taxes	59,118	55,946	173,544	140,601
Income tax expense	19,590	18,129	58,034	45,543
Net income	$ 39,528	$ 37,817	$ 115,510	$ 95,058
Earnings per share:
Basic (in dollars per share)	$ 0.43	$ 0.40	$ 1.26	$ 1.01
Diluted (in dollars per share)	0.43	0.40	1.25	1.00
Dividends declared per common share (in dollars per share)	$ 0.14	$ 0.13	$ 0.39	$ 0.33