Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
INTEREST REVENUE:
Loans and leases	$ 109,078	$ 103,428	$ 216,883	$ 205,563
Deposits with other banks	229	126	492	362
Available-for-sale securities:
Taxable	6,009	6,424	11,897	13,268
Tax-exempt	2,924	3,335	5,956	6,712
Loans held for sale	1,183	1,317	2,167	2,222
Total interest revenue	119,423	114,630	237,395	228,127
Deposits:
Interest bearing demand	2,208	2,262	4,371	4,445
Savings	451	426	894	838
Other time	3,436	3,827	6,790	7,835
Federal funds purchased and securities sold under agreement to repurchase	159	85	299	167
Long-term debt	665	556	1,195	1,133
Junior subordinated debt	187	165	370	328
Other	1		1	(1)
Total interest expense	7,107	7,321	13,920	14,745
Net interest revenue	112,316	107,309	223,475	213,382
Provision for credit losses	2,000	(5,000)	3,000	(10,000)
Net interest revenue, after provision for credit losses	110,316	112,309	220,475	223,382
NONINTEREST REVENUE:
Mortgage banking	9,043	14,102	11,661	22,669
Credit card, debit card and merchant fees	9,495	9,298	18,456	17,837
Deposit service charges	11,018	11,527	22,032	22,779
Security gains, net	86	41	88	55
Insurance commissions	28,803	29,319	62,052	62,812
Wealth management	5,347	5,508	10,456	11,718
Other	5,891	4,519	10,453	9,759
Total noninterest revenue	69,683	74,314	135,198	147,629
NONINTEREST EXPENSE:
Salaries and employee benefits	81,832	79,759	164,299	160,938
Occupancy, net of rental income	10,109	10,419	20,382	20,613
Equipment	3,295	4,024	7,060	7,998
Deposit insurance assessments	2,582	2,377	4,870	4,688
Regulatory settlement			10,277
Other	30,900	31,598	64,130	70,873
Total noninterest expense	128,718	128,177	271,018	265,110
Income before income taxes	51,281	58,446	84,655	105,901
Income tax expense	16,589	18,733	27,414	33,922
Net income	$ 34,692	$ 39,713	$ 57,241	$ 71,979
Earnings per share:
Basic (in dollars per share)	$ 0.37	$ 0.41	$ 0.61	$ 0.75
Diluted (in dollars per share)	0.37	0.41	0.60	0.74
Dividends declared per common share (in dollars per share)	$ 0.10	$ 0.075	$ 0.20	$ 0.15