Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest income:
Loans, including fees	$ 110,268	$ 103,316	$ 214,583	$ 205,372
Securities:
Taxable	22,114	25,485	43,517	52,862
Tax-exempt	37,969	28,690	73,533	56,644
Interest-bearing deposits	2,681	1,498	5,085	2,851
Federal funds sold and resell agreements	23	29	43	51
Total interest income	173,055	159,018	336,761	317,780
Interest expense:
Deposits	2,567	3,882	5,128	7,890
Federal funds purchased and repurchase agreements	34	29	61	59
Junior subordinated deferrable interest debentures	601	1,690	1,162	3,363
Other long-term borrowings	224	236	446	474
Total interest expense	3,426	5,837	6,797	11,786
Net interest income	169,629	153,181	329,964	305,994
Provision for loan losses	4,924	3,575	11,524	9,575
Net interest income after provision for loan losses	164,705	149,606	318,440	296,419
Non-interest income:
Trust and investment management fees	26,748	22,561	52,159	44,446
Service charges on deposit accounts	20,462	20,044	40,436	40,088
Insurance commissions and fees	9,823	9,266	22,949	22,336
Interchange and debit card transaction fees	4,627	4,268	8,870	8,279
Other charges, commissions and fees	8,550	8,578	16,757	16,333
Net gain (loss) on securities transactions	2	6	2	11
Other	8,938	7,786	15,467	18,796
Total non-interest income	79,150	72,509	156,640	150,289
Non-interest expense:
Salaries and wages	70,473	66,502	140,690	132,967
Employee benefits	14,806	14,629	32,194	32,620
Net occupancy	13,733	12,645	26,686	24,624
Furniture and equipment	15,207	14,986	30,160	29,171
Deposit insurance	3,145	2,835	6,262	5,724
Intangible amortization	806	788	1,495	1,608
Other	45,800	37,373	84,424	78,858
Total non-interest expense	163,970	149,758	321,911	305,572
Income before income taxes	79,885	72,357	153,169	141,136
Income taxes	13,415	12,694	25,511	26,285
Net income	66,470	59,663	127,658	114,851
Preferred stock dividends	2,015	2,688	4,031	2,688
Net income available to common shareholders	$ 64,455	$ 56,975	$ 123,627	$ 112,163
Earnings per common share:
Basic	$ 1.03	$ 0.95	$ 2.00	$ 1.86
Diluted	$ 1.02	$ 0.94	$ 1.99	$ 1.85