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Commitments, Contingent Liabilities and Off-Balance Sheet Risk (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]    
Commitments and Contingencies      
Line of Credit Facility, Maximum Borrowing Capacity 260.7us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Assets Held-in-trust 163.8us-gaap_AssetsHeldInTrust  
Variable Rate [Member]    
Loss Contingencies [Line Items]    
Commitments and Contingencies   80.0us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= dnbf_VariableRateMember
Fixed Rate [Member]    
Loss Contingencies [Line Items]    
Commitments and Contingencies   9.5us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= dnbf_FixedRateMember
Stand-by Letters Of Credit [Member]    
Loss Contingencies [Line Items]    
Commitments and Contingencies 2.2us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember
1.5us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember
Unfunded Loan And Lines Of Credit Commitments [Member]    
Loss Contingencies [Line Items]    
Commitments and Contingencies 101.7us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dnbf_UnfundedLoanAndLinesOfCreditCommitmentsMember
89.4us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dnbf_UnfundedLoanAndLinesOfCreditCommitmentsMember
Unfunded Loan And Lines Of Credit Commitments [Member] | Variable Rate [Member]    
Loss Contingencies [Line Items]    
Commitments and Contingencies 94.6us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= dnbf_VariableRateMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dnbf_UnfundedLoanAndLinesOfCreditCommitmentsMember
 
Unfunded Loan And Lines Of Credit Commitments [Member] | Fixed Rate [Member]    
Loss Contingencies [Line Items]    
Commitments and Contingencies $ 7.1us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= dnbf_FixedRateMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dnbf_UnfundedLoanAndLinesOfCreditCommitmentsMember