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Investment Securities (Amortized Cost And Estimated Fair Values) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost $ 59,454us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment $ 65,299us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Held-to-maturity Securities, Unrealized Gains 1,221dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains 617dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
Held-to-maturity Securities, Unrealized Losses (576)dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses (2,514)dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
Held-to-maturity, Estimated Fair Value 60,099us-gaap_HeldToMaturitySecuritiesFairValue 63,402us-gaap_HeldToMaturitySecuritiesFairValue
Available for Sale, Total investment securities, Amortized Cost 172,867us-gaap_AvailableForSaleSecuritiesAmortizedCost 124,118us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Unrealized Gains 290dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments 214dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
Available-for-sale Securities, Unrealized Losses (955)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments (2,673)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
Available-for-sale securities 172,202us-gaap_AvailableForSaleSecurities 121,659us-gaap_AvailableForSaleSecurities
US Government Agency Obligations [Member]    
Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost 7,730us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
7,494us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Held-to-maturity Securities, Unrealized Gains 343dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
75dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Held-to-maturity, Estimated Fair Value 8,073us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
7,569us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Government Sponsored Entities (GSE) Mortgage-Backed Securities [Member]    
Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost 3,579us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
5,934us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held-to-maturity Securities, Unrealized Gains 133dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
200dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held-to-maturity, Estimated Fair Value 3,712us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
6,134us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Corporate Bonds [Member]    
Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost 3,951us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
6,357us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
Held-to-maturity Securities, Unrealized Gains 324dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
249dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
Held-to-maturity, Estimated Fair Value 4,275us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
6,606us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
Collateralized Mortgage Obligations GSE [Member]    
Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost 3,605us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedDebtObligationsMember
4,903us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedDebtObligationsMember
Held-to-maturity Securities, Unrealized Gains 3dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedDebtObligationsMember
10dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedDebtObligationsMember
Held-to-maturity Securities, Unrealized Losses (29)dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedDebtObligationsMember
(89)dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedDebtObligationsMember
Held-to-maturity, Estimated Fair Value 3,579us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedDebtObligationsMember
4,824us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedDebtObligationsMember
State And Municipal Tax-Exempt [Member]    
Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost 40,589us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
40,611us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held-to-maturity Securities, Unrealized Gains 418dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
83dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held-to-maturity Securities, Unrealized Losses (547)dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
(2,425)dnbf_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held-to-maturity, Estimated Fair Value 40,460us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
38,269us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
US Government Agency Obligations [Member]    
Securities [Line Items]    
Available for Sale, Total investment securities, Amortized Cost 61,547us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
30,522us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale Securities, Unrealized Gains 4dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
4dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale Securities, Unrealized Losses (197)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
(583)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale securities 61,354us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
29,943us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Government Sponsored Entities (GSE) Mortgage-Backed Securities [Member]    
Securities [Line Items]    
Available for Sale, Total investment securities, Amortized Cost 66,669us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
49,448us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available-for-sale Securities, Unrealized Gains 189dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
180dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available-for-sale Securities, Unrealized Losses (135)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
(698)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available-for-sale securities 66,723us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
48,930us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Corporate Bonds [Member]    
Securities [Line Items]    
Available for Sale, Total investment securities, Amortized Cost 13,208us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
16,944us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available-for-sale Securities, Unrealized Losses (106)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
(394)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available-for-sale securities 13,102us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
16,550us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Collateralized Mortgage Obligations GSE [Member]    
Securities [Line Items]    
Available for Sale, Total investment securities, Amortized Cost 20,499us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
23,836us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Available-for-sale Securities, Unrealized Gains 8dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
18dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Available-for-sale Securities, Unrealized Losses (496)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
(968)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Available-for-sale securities 20,011us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
22,886us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
State And Municipal Tax-Exempt [Member]    
Securities [Line Items]    
Available for Sale, Total investment securities, Amortized Cost 10,917us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
2,091us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Unrealized Gains 87dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Available-for-sale Securities, Unrealized Losses (10)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
(19)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale securities 10,994us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
2,072us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Certificates Of Deposit [Member]    
Securities [Line Items]    
Available for Sale, Total investment securities, Amortized Cost   1,250us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember
Available-for-sale Securities, Unrealized Gains   10dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember
Available-for-sale securities   1,260us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember
Equity Securities [Member]    
Securities [Line Items]    
Available for Sale, Total investment securities, Amortized Cost 27us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
27us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Available-for-sale Securities, Unrealized Gains 2dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
2dnbf_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Available-for-sale Securities, Unrealized Losses (11)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
(11)dnbf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Available-for-sale securities $ 18us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
$ 18us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember