Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest Income
Interest and fees on loans	$ 537,301	$ 581,696	$ 547,365
Interest and dividends on investment securities:
Taxable	57,392	68,698	108,129
Tax-exempt	14,426	13,157	11,273
Dividends	6,240	7,107	6,655
Interest on federal funds sold and other short-term investments	738	535	402
Total interest income	616,097	671,193	673,824
Interest Expense
Savings, NOW and money market	17,863	20,090	19,876
Time	29,928	37,466	48,291
Interest on short-term borrowings	590	1,387	1,154
Interest on long-term borrowings and junior subordinated debentures	119,996	122,369	129,692
Total interest expense	168,377	181,312	199,013
Net Interest Income	447,720	489,881	474,811
Provision for credit losses	16,095	25,552	53,335
Net Interest Income After Provision for Credit Losses	431,625	464,329	421,476
Non-Interest Income
Trust and investment services	8,610	7,690	7,523
Insurance commissions	15,907	15,494	15,627
Service charges on deposit accounts	24,115	24,752	22,610
Gains on securities transactions, net	14,678	2,587	32,068
Other-than-temporary impairment losses on securities			(42,775)
Portion recognized in other comprehensive income (loss)(before taxes)		(5,247)	22,807
Net impairment losses on securities recognized in earnings		(5,247)	(19,968)
Trading gains, net	909	2,793	2,271
Fees from loan servicing	7,020	4,843	4,337
Gains on sales of loans, net	33,695	46,998	10,699
Gains (losses) on sales of assets, net	10,947	(329)	426
Bank owned life insurance	5,962	6,855	7,380
Change in FDIC loss-share receivable	(8,427)	(7,459)	13,403
Other	15,237	21,969	15,921
Total non-interest income	128,653	120,946	112,297
Non-Interest Expense
Salary and employee benefits expense	194,410	199,968	176,307
Net occupancy and equipment expense	71,634	71,245	66,332
FDIC insurance assessment	16,767	14,292	12,759
Amortization of other intangible assets	8,258	9,783	9,315
Professional and legal fees	16,491	15,005	15,312
Advertising	6,127	7,103	8,373
Other	67,651	57,504	50,158
Total non-interest expense	381,338	374,900	338,556
Income (loss) before income taxes	178,940	210,375	195,217
Income tax expense	46,979	66,748	62,706
Net Income	$ 131,961	$ 143,627	$ 132,511
Earnings Per Common Share:
Basic	$ 0.66	$ 0.73	$ 0.74
Diluted	$ 0.66	$ 0.73	$ 0.74
Cash Dividends Declared Per Common Share	$ 0.60	$ 0.65	$ 0.66
Weighted Average Number of Common Shares Outstanding:
Basic	199,309,425	197,354,159	178,424,883
Diluted	199,309,425	197,354,372	178,426,070