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Note 6 - Derivatives and Hedging Activities (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Jun. 30, 2014
Note 6 - Derivatives and Hedging Activities (Details) [Line Items]      
Payments for Hedge, Investing Activities $ 2,071,650us-gaap_PaymentsForHedgeInvestingActivities    
Noninterest Income [Member] | Cash Flow Hedging [Member]      
Note 6 - Derivatives and Hedging Activities (Details) [Line Items]      
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing   30,212us-gaap_DerivativeInstrumentsGainRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= qcrh_NoninterestIncomeMember
 
Cash Flow Hedging [Member] | Interest Rate Cap [Member]      
Note 6 - Derivatives and Hedging Activities (Details) [Line Items]      
Number of Interest Rate Derivatives Held     2us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Payments for Hedge, Investing Activities     $ 2,100,000us-gaap_PaymentsForHedgeInvestingActivities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember