Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Loans, including fees	$ 146,967	$ 150,982
Loans held for sale	96	195
Securities-taxable	20,790	22,708
Securities-tax exempt	880	1,027
Federal funds sold and other short term investments	354	228
Total interest income	169,087	175,140
Interest expense:
Deposits	7,126	5,352
Short-term borrowings	172	1,049
Long-term debt and other interest expense	3,631	3,177
Total interest expense	10,929	9,578
Net interest income	158,158	165,562
Provision for loan losses	6,154	7,963
Net interest income after provision for loan losses	152,004	157,599
Noninterest income:
Service charges on deposit accounts	17,315	18,712
Trust fees	11,200	10,238
Bank card and ATM fees	11,183	10,569
Investment and annuity fees	5,050	4,952
Secondary mortgage market operations	2,664	1,965
Insurance commissions and fees	1,754	3,744
Amortization of FDIC loss share receivable	(1,197)	(3,908)
Other income	8,244	10,427
Securities transactions gains, net	333
Total noninterest income	56,546	56,699
Noninterest expense:
Compensation expense	65,017	67,165
Employee benefits	15,634	14,267
Personnel expense	80,651	81,432
Net occupancy expense	11,177	11,266
Equipment expense	3,935	4,274
Data processing expense	13,556	12,419
Professional services expense	15,370	6,409
Amortization of intangibles	6,318	7,038
Telecommunications and postage	3,651	3,583
Deposit insurance and regulatory fees	3,595	2,967
Other real estate expense, net	456	1,777
Other expense	14,806	15,817
Total noninterest expense	153,515	146,982
Income before income taxes	55,035	67,316
Income taxes	14,876	18,201
Net income	$ 40,159	$ 49,115
Basic earnings per common share	$ 0.49	$ 0.58
Diluted earnings per common share	$ 0.49	$ 0.58
Dividends paid per share	$ 0.24	$ 0.24
Weighted average shares outstanding-basic	79,496	82,277
Weighted average shares outstanding-diluted	79,661	82,534