Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities
Net income	$ 17,442	$ 19,445
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and accretion	1,412	810
Provision for loan losses	3,625	2,372
Depreciation of premises and equipment	2,195	2,276
Deferred income tax expense (benefit)	263	(1,271)
Accretion of gain from sale of interest rate floors		(295)
Net periodic employee benefit cost	262	192
Net realized investment securities (gains)	(497)	(3,128)
Stock-compensation expense	657	665
Increase in value of bank-owned life insurance	(1,462)	(1,503)
Proceeds from bank-owned life insurance		(14)
Change in accrued interest receivable	454	(440)
Change in other assets	545	3,051
Change in other liabilities	(1,647)	3,222
Net Cash Provided by Operating Activities	23,249	25,410
Investing Activities
Proceeds from sale of money market and mutual fund securities available-for-sale		471,831
Purchases of money market and mutual fund securities available-for-sale		(525,502)
Proceeds from sales of securities available-for-sale	15,642	56,101
Proceeds from maturities and calls of securities available-for-sale	51,167	64,844
Proceeds from maturities and calls of securities held-to-maturity	4,158
Purchases of securities available-for-sale	(66,560)	(74,287)
Net (increase) in loans	(23,152)	(34,123)
Purchases of premises and equipment	(4,944)	(2,149)
Acquisition of Virginia Savings Bancorp, net of cash acquired of $25,060	20,389
Net Cash Used in Investing Activities	(3,300)	(43,285)
Financing Activities
Net increase in noninterest-bearing deposits	40,841	15,568
Net increase in interest-bearing deposits	10,580	47,678
Net (decrease) increase in short-term borrowings	(65,976)	14,489
Purchases of treasury stock	(7,915)	(15,085)
Proceeds from exercise of stock options	488	153
Dividends paid	(10,326)	(10,462)
Net Cash (Used in) Provided by Financing Activities	(32,308)	52,341
(Decrease) increase in Cash and Cash Equivalents	(12,359)	34,466
Cash and cash equivalents at beginning of period	146,399	66,379
Cash and Cash Equivalents at End of Period	$ 134,040	$ 100,845