Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
ASSETS
Cash and due from banks	$ 153,997	$ 93,059	$ 114,655
Interest-bearing deposits with banks	1,417,102	1,111,020	908,653
Federal funds sold	100	41,207	5,000
Securities (market value: $583,414, $581,106, and $746,972, respectively)	582,843	746,343	580,317
Loans:
Total loans (net of unearned interest)	2,861,844	2,811,964	2,793,346
Allowance for loan losses	(37,092)	(35,745)	(37,002)
Loans, net	2,824,752	2,776,219	2,756,344
Premises and equipment, net	102,801	97,796	91,809
Other real estate owned	14,991	22,956	9,517
Intangible assets, net	10,857	11,610	7,837
Goodwill	44,593	44,548	35,886
Accrued interest receivable	19,863	21,914	25,475
Other assets	95,546	93,577	92,529
Total assets	5,267,445	5,060,249	4,628,022
LIABILITIES AND STOCKHOLDERS' EQUITY
Noninterest-bearing	1,509,433	1,318,431	1,253,808
Interest-bearing	3,192,566	3,185,323	2,863,552
Total deposits	4,701,999	4,503,754	4,117,360
Short-term borrowings	1,400	7,250	2,100
Accrued interest payable	3,107	3,235	3,019
Long-term borrowings	32,121	34,265
Other liabilities	29,555	24,285	33,147
Junior subordinated debentures	28,866	28,866	26,804
Total liabilities	4,797,048	4,601,655	4,182,430
Commitments and contingent liabilities
Stockholders' equity:
Common stock, $1.00 par, 20,000,000 shares authorized; shares issued and outstanding: 15,273,181, 15,346,800 and 15,368,717, respectively	15,273	15,369	15,347
Capital surplus	74,229	73,040	71,196
Retained earnings	371,150	361,680	347,979
Accumulated other comprehensive income, net of income tax of $5,080, $5,960 and $4,551, respectively	9,745	8,505	11,070
Total stockholders' equity	470,397	458,594	445,592
Total liabilities and stockholders' equity	5,267,445	5,060,249	4,628,022
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value