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Summary of Significant Accounting Policies (Loans Held-For-Sale) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held-for-sale $ 617us-gaap_LoansReceivableHeldForSaleNet  
Loans Held-For-Sale [Member] | Gain On Sale Of Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value Adjustment Gain 23us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= dnbf_GainLossOnSaleOfLoansMember		   
Carrying Amount [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held-for-sale 617us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueEstimateNotPracticableCarryingReportedAmountMember		   
Fair Value [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held-for-sale $ 640us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember