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Note 2 - Community National Bancorporation and Community National Bank (Details) - Core Deposit (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 2 - Community National Bancorporation and Community National Bank (Details) - Core Deposit [Line Items]    
Balance, beginning $ 1,870,433us-gaap_FiniteLivedIntangibleAssetsNet  
Amortization expense 199,512us-gaap_AmortizationOfIntangibleAssets 178,881us-gaap_AmortizationOfIntangibleAssets
Balance, ending 1,670,921us-gaap_FiniteLivedIntangibleAssetsNet 1,870,433us-gaap_FiniteLivedIntangibleAssetsNet
Net carrying amount 1,670,921us-gaap_FiniteLivedIntangibleAssetsNet 1,870,433us-gaap_FiniteLivedIntangibleAssetsNet
Core Deposits [Member]    
Note 2 - Community National Bancorporation and Community National Bank (Details) - Core Deposit [Line Items]    
Balance, beginning 1,870,433us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
 
Core deposit intangible from Community National Acquistion   3,440,076us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
Amortization expense (199,512)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
(178,881)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
Core deposit intangible sold in branch sales   (1,390,762)qcrh_IntangibleAssetDisposedOfDuringPeriod
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
Balance, ending 1,670,921us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
1,870,433us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
Gross carrying amount 1,995,127us-gaap_FiniteLivedCoreDepositsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
1,995,127us-gaap_FiniteLivedCoreDepositsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
Accumulated amortization (324,206)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
(124,694)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
Net carrying amount $ 1,670,921us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
$ 1,870,433us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember