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Note 16 - Accumulated Other Comprehensive Income (Details) - Components of Accumulated Other Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Accumulated other comprehensive income (loss) $ 1,375us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1       $ (5,170)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1       $ 1,375us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 $ (5,170)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
Tax effect (731)us-gaap_IncomeTaxExpenseBenefit (580)us-gaap_IncomeTaxExpenseBenefit (636)us-gaap_IncomeTaxExpenseBenefit (697)us-gaap_IncomeTaxExpenseBenefit (519)us-gaap_IncomeTaxExpenseBenefit (604)us-gaap_IncomeTaxExpenseBenefit (490)us-gaap_IncomeTaxExpenseBenefit (733)us-gaap_IncomeTaxExpenseBenefit (2,644)us-gaap_IncomeTaxExpenseBenefit (2,346)us-gaap_IncomeTaxExpenseBenefit
Accumulated other comprehensive income (loss), net of tax 907us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax       (3,412)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax       907us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (3,412)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated Net Unrealized Investment Gain (Loss) [Member]                    
Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Unrealized net holding gains (losses) on available-for-sale securities                 1,975us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
(4,281)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Unrealized losses on available-for-sale securities for which a portion of an other-than-temporary impairment loss has been recognized in earnings                 (600)qnbc_UnrealizedLossesOnAvailableForSaleSecuritiesPortionOfOTTILossRecognizedInEarnings
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
(889)qnbc_UnrealizedLossesOnAvailableForSaleSecuritiesPortionOfOTTILossRecognizedInEarnings
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Tax effect                 $ (468)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
$ 1,758us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember