Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
INTEREST INCOME
Interest on Loans	$ 174,450	$ 177,064	$ 172,128
Taxable Interest and Dividends on Securities	20,326	23,984	28,695
Non-taxable Interest and Dividends on Securities	331	673	947
Interest on Loans Held for Sale	482	666	629
Interest on Federal Funds Sold	162	337	290
TOTAL INTEREST AND DIVIDEND INCOME	195,751	202,724	202,689
INTEREST EXPENSE
Interest on Deposits	13,355	20,254	31,163
Interest on Borrowings	15,317	18,509	20,832
TOTAL INTEREST EXPENSE	28,672	38,763	51,995
NET INTEREST INCOME	167,079	163,961	150,694
PROVISION FOR LOAN LOSSES	11,482	18,655	17,335
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	155,597	145,306	133,359
NONINTEREST INCOME
Service Charges on Deposit Accounts	16,628	13,624	12,951
Interchange and ATM Fees	7,733	5,084	4,109
Investment Management	13,532	11,723	10,047
Mortgage Banking Income	4,197	5,041	4,857
Increase in Cash Surrender Value of Life Insurance Policies	3,170	3,192	2,939
Net Gain on Sales of Securities	723	458	1,354
Gain Resulting From Early Termination of Hedging Relationship			3,778
Gross Change on Write-Down of Certain Investments to Fair Value	53	497	(7,382)
Less: Portion of OTTI Losses Recognized in OCI	(296)	(831)	(1,576)
Net Loss on Write-Down of Certain Investments to Fair Value	(243)	(334)	(8,958)
Other Noninterest Income	6,960	8,118	7,115
TOTAL NONINTEREST INCOME	52,700	46,906	38,192
NONINTEREST EXPENSES
Salaries and Employee Benefits	81,275	76,983	68,257
Occupancy and Equipment Expenses	16,916	16,011	15,673
Data Processing & Facilities Management	4,891	5,773	5,779
Advertising Expense	3,876	2,171	2,199
FDIC Assessment	3,496	5,247	6,975
Consulting Expense	2,660	2,523	1,951
Legal Fees	2,262	3,277	2,961
Telecommunications	2,092	2,101	2,635
Prepayment Fee on Borrowings	757
Merger and Acquisition Expense			12,423
Other Non-Interest Expenses	27,488	25,659	22,962
TOTAL NONINTEREST EXPENSES	145,713	139,745	141,815
INCOME BEFORE INCOME TAXES	62,584	52,467	29,736
PROVISION FOR INCOME TAXES	17,148	12,227	6,747
NET INCOME	45,436	40,240	22,989
PREFERRED STOCK DIVIDEND			5,698
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	$ 45,436	$ 40,240	$ 17,291
BASIC EARNINGS PER SHARE	$ 2.12	$ 1.90	$ 0.88
DILUTED EARNINGS PER SHARE	$ 2.12	$ 1.90	$ 0.88
WEIGHTED AVERAGE COMMON SHARES (BASIC)	21,422,757	21,178,117	19,642,965
Common Share Equivalents	28,830	25,798	30,191
WEIGHTED AVERAGE COMMON SHARES (DILUTED)	21,451,587	21,203,915	19,673,156
CASH DIVIDENDS DECLARED PER COMMON SHARE	$ 0.76	$ 0.72	$ 0.72