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Note 3 - Investment Securities (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Number of Securities | 495 qcrh_NumberOfSecurities |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 212 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 |  |
Aggregate Depreciation From Amortized Cost Basis, Percent | 1.00%qcrh_AggregateDepreciationFromAmortizedCostBasisPercent |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | 164 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear |  |
Available-for-sale Securities Pledged as Collateral (in Dollars) | $ 402,507,865 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral | $ 497,286,275 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral |
Municipal Bonds [Member] | Aggregate Fair Value Exceeding $5 Million [Member] | General Obligation Bonds [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Number of States Investments Held In | 3 qcrh_NumberOfStatesInvestmentsHeldIn / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_StatementScenarioAxis = qcrh_AggregateFairValueExceeding5MillionMember | 2 qcrh_NumberOfStatesInvestmentsHeldIn / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_StatementScenarioAxis = qcrh_AggregateFairValueExceeding5MillionMember |
Municipal Bonds [Member] | Aggregate Fair Value Exceeding $5 Million [Member] | Revenue Bonds [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Number of States Investments Held In | 4 qcrh_NumberOfStatesInvestmentsHeldIn / invest_InvestmentAxis = qcrh_RevenueBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_StatementScenarioAxis = qcrh_AggregateFairValueExceeding5MillionMember | 4 qcrh_NumberOfStatesInvestmentsHeldIn / invest_InvestmentAxis = qcrh_RevenueBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_StatementScenarioAxis = qcrh_AggregateFairValueExceeding5MillionMember |
Municipal Bonds [Member] | General Obligation Bonds [Member] | Minimum [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Other Investments (in Dollars) | 5,000,000 us-gaap_OtherInvestments / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 5,000,000 us-gaap_OtherInvestments / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Municipal Bonds [Member] | General Obligation Bonds [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Number of Issuers | 77 qcrh_NumberOfIssuers / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 84 qcrh_NumberOfIssuers / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |
Other Investments (in Dollars) | 68,800,000 us-gaap_OtherInvestments / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 54,200,000 us-gaap_OtherInvestments / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |
Number of States Investments Held In | 19 qcrh_NumberOfStatesInvestmentsHeldIn / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 20 qcrh_NumberOfStatesInvestmentsHeldIn / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |
Municipal Bonds [Member] | Revenue Bonds [Member] | Minimum [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Other Investments (in Dollars) | 5,000,000 us-gaap_OtherInvestments / invest_InvestmentAxis = qcrh_RevenueBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 5,000,000 us-gaap_OtherInvestments / invest_InvestmentAxis = qcrh_RevenueBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Municipal Bonds [Member] | Revenue Bonds [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Number of Issuers | 64 qcrh_NumberOfIssuers / invest_InvestmentAxis = qcrh_RevenueBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 52 qcrh_NumberOfIssuers / invest_InvestmentAxis = qcrh_RevenueBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |
Other Investments (in Dollars) | 161,700,000 us-gaap_OtherInvestments / invest_InvestmentAxis = qcrh_RevenueBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 119,300,000 us-gaap_OtherInvestments / invest_InvestmentAxis = qcrh_RevenueBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |
Number of States Investments Held In | 8 qcrh_NumberOfStatesInvestmentsHeldIn / invest_InvestmentAxis = qcrh_RevenueBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 8 qcrh_NumberOfStatesInvestmentsHeldIn / invest_InvestmentAxis = qcrh_RevenueBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |
Equity Securities [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Percentage of Investment Portfolio | 1.00%qcrh_PercentageOfInvestmentPortfolio / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 1.00%qcrh_PercentageOfInvestmentPortfolio / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Other than Temporary Impairment Losses, Investments (in Dollars) | 0 us-gaap_ImpairmentOfInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 0 us-gaap_ImpairmentOfInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 62,400 us-gaap_ImpairmentOfInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Debt Securities [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Other than Temporary Impairment Losses, Investments (in Dollars) | $ 0 us-gaap_ImpairmentOfInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | $ 0 us-gaap_ImpairmentOfInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | $ 0 us-gaap_ImpairmentOfInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
General Obligation Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_StockholdersEquityTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember | 0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_StockholdersEquityTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / invest_InvestmentAxis = qcrh_GeneralObligationBondsMember |
Revenue Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_StockholdersEquityTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / invest_InvestmentAxis = qcrh_RevenueBondsMember | 0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_StockholdersEquityTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / invest_InvestmentAxis = qcrh_RevenueBondsMember |

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