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Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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General Obligation Bonds [Member] | IOWA |  |
Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 14 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 16 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Amortized cost | $ 20,156,969 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | $ 17,946,059 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Fair value | 20,446,655.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 17,444,045.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Average exposure per issuer (fair value) | 1,460,475 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 1,090,253 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
General Obligation Bonds [Member] | MISSOURI |  |
Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 11 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember |
Amortized cost | 8,424,928 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember |
Fair value | 8,426,047.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember |
Average exposure per issuer (fair value) | 766,004 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember |
General Obligation Bonds [Member] | ILLINOIS |  |
Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 10 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 12 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Amortized cost | 22,447,799 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 15,063,325 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Fair value | 22,784,638.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 15,264,718.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Average exposure per issuer (fair value) | 2,278,464 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 1,272,060 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
General Obligation Bonds [Member] | Other States [Member] |  |
Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 42 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 56 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Amortized cost | 16,838,719 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 22,166,026 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Fair value | 17,110,831.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 21,512,582.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Average exposure per issuer (fair value) | 407,401 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 384,153 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
General Obligation Bonds [Member] |  |
Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 77 qcrh_NumberOfIssuers / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 84 qcrh_NumberOfIssuers / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Amortized cost | 67,868,415 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 55,175,410 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Fair value | 68,768,171.0 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 54,221,345.0 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Average exposure per issuer (fair value) | 893,093 qcrh_AverageExposurePerIssuerFairValue / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 645,492 qcrh_AverageExposurePerIssuerFairValue / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Revenue Bonds [Member] | IOWA |  |
Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 20 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 17 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Amortized cost | 59,417,246 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 47,903,572 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 60,402,941.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 46,257,997.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | 3,020,147 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 2,721,059 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Revenue Bonds [Member] | MISSOURI |  |
Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 30 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 21 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Amortized cost | 62,358,276 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 42,085,249 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 62,584,516.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 40,054,613.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | 2,086,151 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 1,907,363 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Revenue Bonds [Member] | Other States [Member] |  |
Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 4 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 5 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Amortized cost | 8,295,311 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 9,009,148 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 8,449,900.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 8,693,222.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | 2,112,475 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 1,738,644 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Revenue Bonds [Member] | INDIANA |  |
Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 8 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 7 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Amortized cost | 17,991,200 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 15,020,000 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 17,925,721.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 14,324,717.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | 2,240,715 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 2,046,388 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Revenue Bonds [Member] | KANSAS |  |
Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 2 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 2 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Amortized cost | 12,307,866 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 11,022,382 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 12,332,528.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 9,997,068.0 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | 6,166,264 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 4,998,534 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Revenue Bonds [Member] |  |
Note 3 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 64 qcrh_NumberOfIssuers / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 52 qcrh_NumberOfIssuers / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Amortized cost | 160,369,899 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 125,040,351 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 161,695,606.0 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 119,327,617.0 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | $ 2,526,494 qcrh_AverageExposurePerIssuerFairValue / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | $ 2,294,762 qcrh_AverageExposurePerIssuerFairValue / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember

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