Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest income:
Loans, including fees	$ 116,415	$ 104,349	$ 330,998	$ 309,721
Securities:
Taxable	22,855	23,007	66,372	75,869
Tax-exempt	39,635	31,402	113,168	88,046
Interest-bearing deposits	2,960	2,077	8,045	4,928
Federal funds sold and resell agreements	20	16	63	67
Total interest income	181,885	160,851	518,646	478,631
Interest expense:
Deposits	2,991	3,522	8,119	11,412
Federal funds purchased and repurchase agreements	35	30	96	89
Junior subordinated deferrable interest debentures	659	1,710	1,821	5,073
Other long-term borrowings	222	236	668	710
Total interest expense	3,907	5,498	10,704	17,284
Net interest income	177,978	155,353	507,942	461,347
Provision for loan losses	390	5,108	11,914	14,683
Net interest income after provision for loan losses	177,588	150,245	496,028	446,664
Non-interest income:
Trust and investment management fees	26,807	22,692	78,966	67,138
Service charges on deposit accounts	20,819	20,742	61,255	60,830
Insurance commissions and fees	11,348	10,371	34,297	32,707
Interchange and debit card transaction fees	4,719	4,376	13,589	12,655
Other charges, commissions and fees	9,804	9,266	26,561	25,599
Net gain (loss) on securities transactions	33	(14)	35	(3)
Other	7,332	6,558	22,799	25,354
Total non-interest income	80,862	73,991	237,502	224,280
Non-interest expense:
Salaries and wages	73,756	68,524	214,446	201,491
Employee benefits	14,639	14,989	46,833	47,609
Net occupancy	14,049	13,094	40,735	37,718
Furniture and equipment	16,078	14,629	46,238	43,800
Deposit insurance	3,421	2,921	9,683	8,645
Intangible amortization	1,029	780	2,524	2,388
Other	40,856	36,886	125,280	115,744
Total non-interest expense	163,828	151,823	485,739	457,395
Income before income taxes	94,622	72,413	247,791	213,549
Income taxes	17,007	11,969	42,518	38,254
Net income	77,615	60,444	205,273	175,295
Preferred stock dividends	2,016	2,015	6,047	4,703
Net income available to common shareholders	$ 75,599	$ 58,429	$ 199,226	$ 170,592
Earnings per common share:
Basic	$ 1.20	$ 0.96	$ 3.20	$ 2.82
Diluted	$ 1.19	$ 0.96	$ 3.18	$ 2.81