Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating Activities
Net income	$ 28,049	$ 31,024
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and accretion	1,356	1,296
Provision for loan losses	4,600	2,372
Depreciation of premises and equipment	3,371	3,408
Deferred income tax expense (benefit)	342	(1,802)
Accretion of gain from sale of interest rate floors		(295)
Net periodic employee benefit cost	391	288
Realized investment securities gains	(1,530)	(3,756)
Net investment securities impairment losses	576	355
Stock-compensation expense	870	867
Increase in value of bank-owned life insurance	(2,164)	(2,455)
Proceeds from bank-owned life insurance		492
Change in accrued interest receivable	(137)	464
Change in other assets	(735)	(4,694)
Change in other liabilities	2,092	14,711
Net Cash Provided by Operating Activities	37,081	42,275
Investing Activities
Proceeds from sale of money market and mutual fund securities available-for-sale		617,230
Purchases of money market and mutual fund securities available-for-sale		(617,337)
Proceeds from sales of securities available-for-sale	27,773	56,371
Proceeds from maturities and calls of securities available-for-sale	113,760	88,807
Proceeds from maturities and calls of securities held-to-maturity	10,046	1,338
Purchases of securities available-for-sale	(150,497)	(107,050)
Net (increase) in loans	(43,656)	(61,800)
Purchases of premises and equipment	(5,910)	(3,691)
Acquisition of Virginia Savings Bancorp, net of cash acquired of $24,947	20,275
Net Cash Used in Investing Activities	(28,209)	(26,132)
Financing Activities
Net increase in noninterest-bearing deposits	26,777	25,577
Net increase (decrease) in interest-bearing deposits	10,815	(2,631)
Net (decrease) increase in short-term borrowings	(57,103)	15,171
Purchases of treasury stock	(7,915)	(21,429)
Proceeds from exercise of stock options	544	168
Dividends paid	(15,517)	(15,591)
Net Cash (Used in) Provided by Financing Activities	(42,399)	1,265
(Decrease) increase in Cash and Cash Equivalents	(33,527)	17,408
Cash and cash equivalents at beginning of period	146,399	66,379
Cash and Cash Equivalents at End of Period	$ 112,872	$ 83,787