Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
INTEREST INCOME
Interest and fees on loans	$ 173,649	$ 159,656
Interest and dividends on investment securities:
Taxable	23,475	25,516
Tax exempt	8,129	7,830
Other interest	1,536	1,067
Total interest income	206,789	194,069
INTEREST EXPENSE
Interest on deposits	16,924	11,766
Interest on Federal funds purchased and securities sold under agreements to repurchase	515	296
Interest on other short-term funding	1,080	515
Interest on long-term funding	7,996	9,505
Total interest expense	26,515	22,082
NET INTEREST INCOME	180,274	171,987
Provision for credit losses	9,000	20,000
Net interest income after provision for credit losses	171,274	151,987
NONINTEREST INCOME
Trust service fees	11,935	11,447
Service charges on deposit accounts	16,356	16,273
Card-based and other nondeposit fees	12,465	11,991
Insurance commissions	21,620	21,382
Brokerage and annuity commissions	4,333	3,794
Mortgage banking, net	4,579	4,204
Capital market fees, net	3,883	3,538
Bank owned life insurance income	2,615	4,770
Asset gains (losses), net	(234)	524
Investment securities gains, net	0	3,098
Other	2,279	2,171
Total noninterest income	79,831	83,192
NONINTEREST EXPENSE
Personnel expense	104,419	101,398
Occupancy	15,219	13,802
Equipment	5,485	5,446
Technology	14,420	14,264
Business development and advertising	5,835	8,211
Other intangible amortization	513	504
Loan expense	2,620	3,221
Legal and professional fees	4,166	5,025
Foreclosure / OREO expense	1,505	1,877
FDIC expense	8,000	7,750
Other	11,509	12,473
Total noninterest expense	173,691	173,971
Income before income taxes	77,414	61,208
Income tax expense	21,144	18,674
Net income	56,270	42,534
Preferred stock dividends	2,330	2,198
Net income available to common equity	$ 53,940	$ 40,336
Earnings per common share:
Basic (in usd per share)	$ 0.36	$ 0.27
Diluted (in usd per share)	$ 0.35	$ 0.27
Average common shares outstanding:
Basic (in shares)	150,815	148,601
Diluted (in shares)	153,869	149,454