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Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common dividends declared, per share	$ 0.50us-gaap_CommonStockDividendsPerShareDeclared	$ 0.48us-gaap_CommonStockDividendsPerShareDeclared	$ 0.43us-gaap_CommonStockDividendsPerShareDeclared
Preferred dividends declared, per share	$ 60us-gaap_PreferredStockDividendsPerShareDeclared	$ 60us-gaap_PreferredStockDividendsPerShareDeclared	$ 60.00us-gaap_PreferredStockDividendsPerShareDeclared
Preferred stock converted to common stock, shares	6,900us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	149,730us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	103,500us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
Common stock options exercised, shares	3,854us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	5,850us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	5,223us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Restricted stock awards shares	13,933us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	40,371us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	5,300us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
Purchase of treasury shares	132,773us-gaap_TreasuryStockSharesAcquired	1,739,601us-gaap_TreasuryStockSharesAcquired	67,438us-gaap_TreasuryStockSharesAcquired
Treasury stock shares acquired cost per share	$ 16.29us-gaap_TreasuryStockAcquiredAverageCostPerShare	$ 16.31us-gaap_TreasuryStockAcquiredAverageCostPerShare	$ 15.00us-gaap_TreasuryStockAcquiredAverageCostPerShare
Acquisition of Peoples Bank of Virginia, shares			2,157,005us-gaap_StockIssuedDuringPeriodSharesAcquisitions

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Aggregate dividends declared during the period for each share of common stock outstanding.

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