Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
ASSETS
Cash and due from banks	$ 146,904	$ 93,059	$ 106,498
Interest-bearing deposits with banks	1,463,388	1,111,020	918,725
Federal funds sold		41,207	5,000
Securities (market value: $607,626, $744,432, and $579,737, respectively)	607,046	743,803	578,837
Loans:
Total loans (net of unearned interest)	2,984,114	2,811,964	2,756,118
Allowance for loan losses	(37,456)	(35,745)	(35,681)
Loans, net	2,946,658	2,776,219	2,720,437
Premises and equipment, net	110,001	97,796	92,005
Other real estate owned	16,222	22,956	21,252
Intangible assets, net	14,883	11,610	7,577
Goodwill	44,593	44,548	35,890
Accrued interest receivable	17,657	21,914	24,114
Other assets	104,954	96,117	88,847
Total assets	5,472,306	5,060,249	4,599,182
LIABILITIES AND STOCKHOLDERS' EQUITY
Noninterest-bearing	1,624,314	1,318,431	1,232,548
Interest-bearing	3,263,018	3,185,323	2,850,020
Total deposits	4,887,332	4,503,754	4,082,568
Short-term borrowings	12,279	7,250	2,700
Accrued interest payable	2,874	3,235	2,903
Long-term borrowings	28,049	34,265
Other liabilities	31,293	24,285	30,338
Junior subordinated debentures	36,083	28,866	26,804
Total liabilities	4,997,910	4,601,655	4,145,313
Commitments and contingent liabilities
Stockholders' equity:
Common stock, $1.00 par, 20,000,000 shares authorized; shares issued and outstanding: 15,125,541, 15,368,717 and 15,358,672, respectively	15,126	15,369	15,359
Capital surplus	74,966	73,040	72,403
Retained earnings	374,140	361,680	355,340
Accumulated other comprehensive income, net of income tax of $5,484, $4,551 and $5,797, respectively	10,164	8,505	10,767
Total stockholders' equity	474,396	458,594	453,869
Total liabilities and stockholders' equity	5,472,306	5,060,249	4,599,182
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value