Consolidated Condensed Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Interest and dividend income:
Interest and fees on loans	$ 65,862	$ 66,723	$ 131,316	$ 133,164
Interest and dividends on:
Obligations of U.S. Government, its agencies and other securities	18,960	20,263	38,013	40,738
Obligations of states and political subdivisions	92	204	241	421
Other interest income	8	52	14	121
Total interest and dividend income	84,922	87,242	169,584	174,444
Interest on deposits:
Demand and savings deposits	951	1,582	1,942	3,357
Time deposits	6,200	9,518	12,934	20,168
Interest on borrowings:
Short-term borrowings	193	302	460	646
Long-term debt	7,556	7,119	14,913	14,172
Total interest expense	14,900	18,521	30,249	38,343
Net interest income	70,022	68,721	139,335	136,101
Provision for loan losses	12,516	13,250	26,616	29,800
Net interest income after provision for loan losses	57,506	55,471	112,719	106,301
Other income:
Income from fiduciary activities	3,929	3,528	7,651	6,950
Service charges on deposit accounts	4,525	5,092	8,770	9,838
Other service income	2,734	3,476	5,035	6,458
Checkcard fee income	3,251	2,765	6,227	5,209
Bank owned life insurance income	1,228	1,254	2,457	2,470
ATM fees	682	832	1,336	1,597
OREO devaluations	(3,355)	(1,919)	(5,890)	(3,064)
Other	2,144	1,619	4,582	3,899
Total other income	15,138	16,647	30,168	33,357
Gain on sale of securities	15,362	3,515	21,997	11,819
Other expense:
Salaries and employee benefits	25,253	24,013	50,317	49,184
Occupancy expense	2,764	2,793	5,764	5,910
Furniture and equipment expense	2,785	2,564	5,442	5,196
Data processing fees	1,135	1,394	2,388	2,987
Professional fees and services	5,320	5,299	10,194	10,155
Amortization of intangibles	669	842	1,338	1,778
Marketing	728	946	1,351	1,848
Insurance	2,345	2,333	4,614	4,531
Communication	1,485	1,647	3,041	3,416
State taxes	488	838	945	1,683
Other expense	4,035	4,332	7,959	8,203
Total other expense	47,007	47,001	93,353	94,891
Income before income taxes	40,999	28,632	71,531	56,586
Income taxes	12,046	7,466	20,382	14,641
Net income	28,953	21,166	51,149	41,945
Preferred stock dividends and accretion	1,464	1,451	2,928	2,903
Net income available to common shareholders	$ 27,489	$ 19,715	$ 48,221	$ 39,042
Net income available to common shareholders
Basic	$ 1.79	$ 1.30	$ 3.13	$ 2.60
Diluted	$ 1.79	$ 1.30	$ 3.13	$ 2.60
Weighted average common shares outstanding
Basic	15,398,919	15,114,846	15,398,925	14,998,810
Diluted	15,399,593	15,114,846	15,401,506	14,998,810
Cash dividends declared	$ 0.94	$ 0.94	$ 1.88	$ 1.88