Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
INTEREST REVENUE:
Loans and leases	$ 115,286	$ 109,078	$ 226,784	$ 216,883
Deposits with other banks	256	229	741	492
Available-for-sale securities:
Taxable	7,509	6,009	14,859	11,897
Tax-exempt	2,562	2,924	5,143	5,956
Loans held for sale	1,242	1,183	2,254	2,167
Total interest revenue	126,855	119,423	249,781	237,395
Deposits:
Interest bearing demand	3,204	2,208	5,990	4,371
Savings	483	451	955	894
Other time	3,725	3,436	7,307	6,790
Federal funds purchased and securities sold under agreement to repurchase	509	159	831	299
Long-term debt	1,456	665	2,598	1,195
Junior subordinated debt		187	9	370
Other		1	2	1
Total interest expense	9,377	7,107	17,692	13,920
Net interest revenue	117,478	112,316	232,089	223,475
Provision for credit losses	1,000	2,000	2,000	3,000
Net interest revenue, after provision for credit losses	116,478	110,316	230,089	220,475
NONINTEREST REVENUE:
Mortgage banking	6,134	7,886	15,124	9,716
Credit card, debit card and merchant fees	9,565	9,495	18,468	18,456
Deposit service charges	9,706	11,018	19,395	22,032
Security gains, net	23	86	1,094	88
Insurance commissions	31,126	28,803	64,066	62,052
Wealth management	5,275	5,347	10,449	10,456
Other	6,301	5,891	10,403	10,453
Total noninterest revenue	68,130	68,526	138,999	133,253
NONINTEREST EXPENSE:
Salaries and employee benefits	81,597	80,675	162,983	162,354
Occupancy, net of rental income	10,455	10,109	20,757	20,382
Equipment	3,438	3,295	7,006	7,060
Deposit insurance assessments	2,261	2,582	4,745	4,870
Regulatory settlement				10,277
Other	29,802	30,900	59,171	64,130
Total noninterest expense	127,553	127,561	254,662	269,073
Income before income taxes	57,055	51,281	114,426	84,655
Income tax expense	19,166	16,589	38,444	27,414
Net income	$ 37,889	$ 34,692	$ 75,982	$ 57,241
Earnings per share:
Basic (in dollars per share)	$ 0.41	$ 0.37	$ 0.82	$ 0.61
Diluted (in dollars per share)	0.41	0.37	0.82	0.60
Dividends declared per common share (in dollars per share)	$ 0.13	$ 0.10	$ 0.25	$ 0.20