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Note 7 - Derivatives and Hedging Activities (Details) (Cash Flow Hedging [Member], USD $)
3 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Noninterest Income [Member]    
Note 7 - Derivatives and Hedging Activities (Details) [Line Items]    
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing $ 341us-gaap_DerivativeInstrumentsGainRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= qcrh_NoninterestIncomeMember
 
Interest Rate Cap [Member]
   
Note 7 - 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