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Deposits (Time Deposits in Excess of $100,000) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Cash and Cash Equivalents [Line Items]    
Contractual Maturities, Time Deposits, $100,000 or More, Three Months or Less $ 6,359us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess  
Contractual Maturities, Time Deposits, $100,000 or More, Three Months Through Six Months 16,015us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths  
Contractual Maturities, Time Deposits, $100,000 or More, Six Months Through 12 Months 16,043us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months  
Contractual Maturities, Time Deposits, $100,000 or More, Over One Year Through Two Years 5,784dnbf_ContractualMaturitiesTimeDeposits100000OrMoreOverOneYearThroughTwoYears  
Contractual Maturities, Time Deposits, $100,000 or More, Over Two Years 10,758dnbf_ContractualMaturitiesTimeDeposits100000OrMoreOverTwoYears  
Time Deposits, $100,000 or More, Total 54,959us-gaap_TimeDeposits100000OrMore 54,400us-gaap_TimeDeposits100000OrMore
Time Deposits [Member]    
Cash and Cash Equivalents [Line Items]    
Contractual Maturities, Time Deposits, $100,000 or More, Three Months or Less 6,359us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
 
Contractual Maturities, Time Deposits, $100,000 or More, Three Months Through Six Months 16,015us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
 
Contractual Maturities, Time Deposits, $100,000 or More, Six Months Through 12 Months 16,043us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
 
Contractual Maturities, Time Deposits, $100,000 or More, Over One Year Through Two Years 1,935dnbf_ContractualMaturitiesTimeDeposits100000OrMoreOverOneYearThroughTwoYears
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
 
Contractual Maturities, Time Deposits, $100,000 or More, Over Two Years 5,177dnbf_ContractualMaturitiesTimeDeposits100000OrMoreOverTwoYears
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
 
Time Deposits, $100,000 or More, Total 45,529us-gaap_TimeDeposits100000OrMore
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
 
Brokered Deposits [Member]    
Cash and Cash Equivalents [Line Items]    
Contractual Maturities, Time Deposits, $100,000 or More, Over One Year Through Two Years 3,849dnbf_ContractualMaturitiesTimeDeposits100000OrMoreOverOneYearThroughTwoYears
/ us-gaap_CashAndCashEquivalentsAxis
= dnbf_BrokeredDepositsMember
 
Contractual Maturities, Time Deposits, $100,000 or More, Over Two Years 5,581dnbf_ContractualMaturitiesTimeDeposits100000OrMoreOverTwoYears
/ us-gaap_CashAndCashEquivalentsAxis
= dnbf_BrokeredDepositsMember
 
Time Deposits, $100,000 or More, Total $ 9,430us-gaap_TimeDeposits100000OrMore
/ us-gaap_CashAndCashEquivalentsAxis
= dnbf_BrokeredDepositsMember