Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
INTEREST INCOME
Interest and fees on loans	$ 143,387	$ 145,527
Interest and dividends on investment securities
Taxable	26,257	21,613
Tax exempt	6,971	6,965
Other interest	1,449	1,247
Total interest income	178,064	175,352
INTEREST EXPENSE
Interest on deposits	6,159	8,541
Interest on Federal funds purchased and securities sold under agreements to repurchase	305	410
Interest on other short-term funding	116	332
Interest on long-term funding	6,511	8,416
Total interest expense	13,091	17,699
NET INTEREST INCOME	164,973	157,653
Provision for credit losses	5,000	3,300
Net interest income after provision for credit losses	159,973	154,353
NONINTEREST INCOME
Trust service fees	11,711	10,910
Service charges on deposit accounts	16,400	16,829
Card-based and other nondeposit fees	12,509	11,950
Insurance commissions	12,317	11,763
Brokerage and annuity commissions	4,033	3,516
Mortgage banking, net	6,361	17,765
Capital market fees, net	2,322	2,583
Bank owned life insurance income	4,320	2,970
Asset gains (losses), net	728	836
Investment securities gains (losses), net	378	300
Other	2,442	2,578
Total noninterest income	73,521	82,000
NONINTEREST EXPENSE
Personnel expense	97,698	97,907
Occupancy	15,560	15,662
Equipment	6,276	6,167
Technology	12,724	11,508
Business development and advertising	5,062	4,537
Other intangible amortization	991	1,011
Loan expense	2,787	3,284
Legal and professional fees	4,188	5,345
Losses other than loans	544	384
Foreclosure/OREO expense	1,896	2,422
FDIC expense	5,001	5,432
Other	14,931	13,956
Total noninterest expense	167,658	167,615
Income before income taxes	65,836	68,738
Income tax expense	20,637	21,350
Net income	45,199	47,388
Preferred stock dividends	1,244	1,300
Net income available to common equity	$ 43,955	$ 46,088
Earnings per common share:
Basic	$ 0.27	$ 0.27
Diluted	$ 0.27	$ 0.27
Average common shares outstanding:
Basic	161,467	168,234
Diluted	162,188	168,404