Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
INTEREST INCOME
Interest and fees on loans	$ 184,246	$ 163,059	$ 357,895	$ 322,715
Interest and dividends on investment securities:
Taxable	23,658	24,270	47,133	49,786
Tax exempt	8,143	7,894	16,272	15,724
Other interest	1,553	1,318	3,089	2,385
Total interest income	217,600	196,541	424,389	390,610
INTEREST EXPENSE
Interest on deposits	21,180	11,678	38,104	23,444
Interest on Federal funds purchased and securities sold under agreements to repurchase	824	378	1,339	674
Interest on other short-term funding	1,827	845	2,907	1,360
Interest on long-term funding	9,950	6,923	17,946	16,428
Total interest expense	33,781	19,824	60,296	41,906
NET INTEREST INCOME	183,819	176,717	364,093	348,704
Provision for credit losses	12,000	14,000	21,000	34,000
Net interest income after provision for credit losses	171,819	162,717	343,093	314,704
NONINTEREST INCOME
Trust service fees	12,346	11,509	24,281	22,956
Service charges on deposit accounts	16,030	16,444	32,386	32,717
Card-based and other nondeposit fees	13,764	12,717	26,229	24,708
Insurance commissions	20,853	22,005	42,473	43,387
Brokerage and annuity commissions	4,346	4,098	8,679	7,892
Mortgage banking, net	5,027	4,067	9,606	8,271
Capital market fees, net	4,042	3,793	7,925	7,331
Bank owned life insurance income	3,899	2,973	6,514	7,743
Asset gains (losses), net	(466)	(343)	(700)	181
Investment securities gains, net	356	3,116	356	6,214
Other	2,213	1,789	4,492	3,960
Total noninterest income	82,410	82,168	162,241	165,360
NONINTEREST EXPENSE
Personnel expense	104,683	102,129	209,102	203,527
Occupancy	12,832	13,215	28,051	27,017
Equipment	5,234	5,396	10,719	10,842
Technology	15,473	14,450	29,893	28,714
Business development and advertising	7,152	6,591	12,987	14,802
Other intangible amortization	496	539	1,009	1,043
Loan expense	2,974	3,442	5,594	6,663
Legal and professional fees	5,711	4,856	9,877	9,881
Foreclosure / OREO expense	1,182	1,330	2,687	3,207
FDIC expense	8,000	8,750	16,000	16,500
Other	12,579	13,662	24,088	26,135
Total noninterest expense	176,316	174,360	350,007	348,331
Income before income taxes	77,913	70,525	155,327	131,733
Income tax expense	19,930	21,434	41,074	40,108
Net income	57,983	49,091	114,253	91,625
Preferred stock dividends	2,339	2,169	4,669	4,367
Net income available to common equity	$ 55,644	$ 46,922	$ 109,584	$ 87,258
Earnings per common share:
Basic (in usd per share)	$ 0.36	$ 0.31	$ 0.72	$ 0.58
Diluted (in usd per share)	$ 0.36	$ 0.31	$ 0.71	$ 0.58
Average common shares outstanding:
Basic (in shares)	151,573	148,511	151,196	148,556
Diluted (in shares)	154,302	149,530	154,147	149,518