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	$ 158,892	$ 166,334	$ 479,525	$ 497,840
Securities-taxable	21,318	21,141	62,242	67,889
Securities-tax exempt	1,176	1,422	3,615	4,377
Federal funds sold and other short term investments	253	308	1,178	1,304
Total interest income	181,639	189,205	546,560	571,410
Interest expense:
Deposits	5,851	7,519	18,785	25,654
Short-term borrowings	1,074	1,514	3,448	4,776
Long-term debt and other interest expense	3,184	2,916	9,603	9,977
Total interest expense	10,109	11,949	31,836	40,407
Net interest income	171,530	177,256	514,724	531,003
Provision for loan losses	7,569	8,101	25,404	26,141
Net interest income after provision for loan losses	163,961	169,155	489,320	504,862
Noninterest income:
Service charges on deposit accounts	20,519	20,834	59,398	58,015
Trust fees	9,477	7,743	27,972	24,464
Bank card and ATM fees	12,221	11,870	34,678	37,586
Investment and annuity fees	5,186	4,269	14,955	13,291
Secondary mortgage market operations	2,467	4,311	10,989	11,328
Insurance commissions and fees	3,661	4,045	12,500	12,103
Other income	9,526	9,770	26,649	31,101
Securities gains, net		917		929
Total noninterest income	63,057	63,759	187,141	188,817
Noninterest expense:
Compensation expense	73,037	76,173	215,715	223,945
Employee benefits	16,340	17,202	49,184	54,881
Personnel expense	89,377	93,375	264,899	278,826
Net occupancy expense	12,369	13,358	37,099	41,784
Equipment expense	5,127	5,212	15,347	19,046
Data processing expense	12,031	11,005	36,346	39,523
Professional services expense	10,899	9,447	27,571	49,207
Amortization of intangibles	7,306	8,110	22,292	24,336
Telecommunications and postage	4,397	5,313	13,484	17,068
Deposit insurance and regulatory fees	3,789	3,833	11,635	11,128
Advertising	2,858	2,243	7,216	12,263
Other expense	34,052	17,818	68,168	61,968
Total noninterest expense	182,205	169,714	504,057	555,149
Income before income taxes	44,813	63,200	172,404	138,530
Income taxes	11,611	16,216	43,764	33,747
Net income	$ 33,202	$ 46,984	$ 128,640	$ 104,783
Basic earnings per common share	$ 0.40	$ 0.55	$ 1.51	$ 1.23
Diluted earnings per common share	$ 0.40	$ 0.55	$ 1.51	$ 1.22
Dividends paid per share	$ 0.24	$ 0.24	$ 0.72	$ 0.72
Weighted avg. shares outstanding-basic	82,091	84,777	83,404	84,757
Weighted avg. shares outstanding-diluted	82,205	85,632	83,496	85,525