Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest income:
Loans, including fees	$ 104,349	$ 101,643	$ 309,721	$ 297,330
Securities:
Taxable	23,007	32,091	75,869	102,556
Tax-exempt	31,402	23,283	88,046	67,911
Interest-bearing deposits	2,077	1,115	4,928	2,948
Federal funds sold and resell agreements	16	27	67	75
Total interest income	160,851	158,159	478,631	470,820
Interest expense:
Deposits	3,522	4,598	11,412	13,717
Federal funds purchased and repurchase agreements	30	37	89	105
Junior subordinated deferrable interest debentures	1,710	1,711	5,073	5,096
Other long-term borrowings	236	281	710	1,446
Total interest expense	5,498	6,627	17,284	20,364
Net interest income	155,353	151,532	461,347	450,456
Provision for loan losses	5,108	2,500	14,683	5,955
Net interest income after provision for loan losses	150,245	149,032	446,664	444,501
Non-interest income:
Trust and investment management fees	22,692	20,843	67,138	62,774
Service charges on deposit accounts	20,742	20,797	60,830	62,230
Insurance commissions and fees	10,371	9,964	32,707	31,512
Interchange and debit card transaction fees	4,376	4,194	12,655	12,603
Other charges, commissions and fees	9,266	7,265	25,599	22,440
Net gain (loss) on securities transactions	(14)	0	(3)	(121)
Other	6,558	8,095	25,354	21,462
Total non-interest income	73,991	71,158	224,280	212,900
Non-interest expense:
Salaries and wages	68,524	64,984	201,491	191,310
Employee benefits	14,989	14,019	47,609	44,768
Net occupancy	13,094	13,193	37,718	37,203
Furniture and equipment	14,629	14,193	43,800	41,347
Deposit insurance	2,921	2,593	8,645	7,928
Intangible amortization	780	973	2,388	2,978
Other	36,886	34,495	115,744	103,492
Total non-interest expense	151,823	144,450	457,395	429,026
Income before income taxes	72,413	75,740	213,549	228,375
Income taxes	11,969	17,071	38,254	50,611
Net Income	60,444	58,669	175,295	177,764
Preferred stock dividends	2,015	0	4,703	0
Net income available to common shareholders	$ 58,429	$ 58,669	$ 170,592	$ 177,764
Earnings per common share:
Basic	$ 0.96	$ 0.95	$ 2.82	$ 2.89
Diluted	$ 0.96	$ 0.95	$ 2.81	$ 2.88