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Note 5 - Loans and Allowance for Loan Losses (Details) - TDRs Subsequently Defaulted (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Commercial:  
TDRs subsequently defaulted, number of contracts 6us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
TDRs subsequently defaulted, recorded investment $ 361us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Commercial Secured By Residential Real Estate [Member]  
Commercial:  
TDRs subsequently defaulted, number of contracts 6us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_CommercialSecuredByResidentialRealEstateMember
TDRs subsequently defaulted, recorded investment $ 361us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_CommercialSecuredByResidentialRealEstateMember