Consolidated Condensed Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Interest and dividend income:
Interest and fees on loans	$ 65,645	$ 67,123	$ 196,961	$ 200,287
Interest and dividends on:
Obligations of U.S. Government, its agencies and other securities	16,289	19,333	54,302	60,071
Obligations of states and political subdivisions	69	192	310	613
Other interest income	62	34	76	155
Total interest and dividend income	82,065	86,682	251,649	261,126
Interest on deposits:
Demand and savings deposits	976	1,263	2,918	4,620
Time deposits	5,661	8,532	18,595	28,700
Interest on borrowings:
Short-term borrowings	182	269	642	915
Long-term debt	7,626	7,173	22,539	21,345
Total interest expense	14,445	17,237	44,694	55,580
Net interest income	67,620	69,445	206,955	205,546
Provision for loan losses	16,438	14,654	43,054	44,454
Net interest income after provision for loan losses	51,182	54,791	163,901	161,092
Other income:
Income from fiduciary activities	3,615	3,314	11,266	10,264
Service charges on deposit accounts	4,894	5,026	13,664	14,864
Other service income	3,087	3,909	8,122	10,367
Checkcard fee income	3,154	2,900	9,381	8,109
Bank owned life insurance income	1,229	1,313	3,686	3,783
ATM fees	726	699	2,062	2,296
OREO devaluations	(588)	(1,555)	(6,478)	(4,619)
Other	1,910	1,924	6,492	5,823
Total other income	18,027	17,530	48,195	50,887
Gain on sale of securities	3,465		25,462	11,819
Other expense:
Salaries and employee benefits	25,799	24,500	76,116	73,684
Occupancy expense	2,665	2,840	8,429	8,750
Furniture and equipment expense	2,688	2,624	8,130	7,820
Data processing fees	1,184	1,403	3,572	4,390
Professional fees and services	5,005	4,477	15,199	14,632
Amortization of intangibles	669	822	2,007	2,600
Marketing	764	840	2,115	2,688
Insurance	681	2,316	5,295	6,847
Communication	1,475	1,696	4,516	5,112
State taxes	469	865	1,414	2,548
Other expense	4,200	3,313	12,159	11,516
Total other expense	45,599	45,696	138,952	140,587
Income before income taxes	27,075	26,625	98,606	83,211
Income taxes	6,694	7,048	27,076	21,689
Net income	20,381	19,577	71,530	61,522
Preferred stock dividends and accretion	1,464	1,452	4,392	4,355
Net income available to common shareholders	$ 18,917	$ 18,125	$ 67,138	$ 57,167
Net income available to common shareholders
Basic	$ 1.23	$ 1.19	$ 4.36	$ 3.79
Diluted	$ 1.23	$ 1.19	$ 4.36	$ 3.79
Weighted average common shares outstanding
Basic	15,398,909	15,272,720	15,398,919	15,090,113
Diluted	15,398,909	15,272,720	15,400,641	15,090,113
Cash dividends declared	$ 0.94	$ 0.94	$ 2.82	$ 2.82