Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating Activities
Net income	$ 34,969	$ 28,049
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and accretion	(7,885)	1,356
Provision for loan losses	4,903	4,600
Depreciation of premises and equipment	4,289	3,371
Deferred income tax expense	4,945	342
Net periodic employee benefit cost	586	391
Realized investment securities gains	(93)	(1,530)
Net investment securities impairment losses	0	576
Stock-compensation expense	963	870
Increase in value of bank-owned life insurance	(2,413)	(2,164)
Loans originated for sale	(20,895)	(30,518)
Proceeds from the sale of loans originated for sale	25,816	29,358
Gain on sale of loans	(553)	(626)
Change in accrued interest receivable	(22)	(137)
Change in other assets	20,734	(735)
Change in other liabilities	(6,922)	2,092
Net Cash Provided by Operating Activities	58,422	35,295
Investing Activities
Proceeds from sales of securities available-for-sale	18,398	27,773
Proceeds from maturities and calls of securities available-for-sale	78,671	113,760
Proceeds from maturities and calls of securities held-to-maturity	9,504	10,046
Purchases of securities available-for-sale	(42,295)	(150,497)
Net (increase) in loans	(39,643)	(41,870)
Purchases of premises and equipment	(4,663)	(5,910)
Net Cash Used in Investing Activities	(1,880)	(26,423)
Financing Activities
Net increase in noninterest-bearing deposits	25,440	26,777
Net (decrease) increase in interest-bearing deposits	(9,360)	10,815
Net increase (decrease) in short-term borrowings	36,297	(57,103)
Purchases of treasury stock	0	(7,915)
Proceeds from exercise of stock options	2,766	544
Dividends paid	(17,058)	(15,517)
Net Cash Provided by (Used in) Financing Activities	38,085	(42,399)
Increase (decrease) in Cash and Cash Equivalents	94,627	(33,527)
Cash and cash equivalents at beginning of period	84,994	146,399
Cash and Cash Equivalents at End of Period	179,621	112,872
Community Bank [Member]
Investing Activities
Acquisitions, net of cash acquired	(21,852)	0
Virginia Savings Bank [Member]
Investing Activities
Acquisitions, net of cash acquired	$ 0	$ 20,275