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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Consolidated Statements of Stockholders' Equity [Abstract]    
Cash Dividends-Common Stock per share $ 0.28us-gaap_CommonStockDividendsPerShareDeclared $ 0.28us-gaap_CommonStockDividendsPerShareDeclared
Sale of treasury shares to 401(k), Shares 11,866us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued 13,396us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued
Sale of treasury shares to deferred compensation plan, Shares 6,020dnbf_SaleOfTreasurySharesToDeferredCompensationPlanShares 6,635dnbf_SaleOfTreasurySharesToDeferredCompensationPlanShares