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Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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General Obligation Bonds [Member] | IOWA |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 15 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 14 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Amortized cost | $ 21,431,325 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | $ 20,156,969 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Fair value | 21,602,520 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 20,446,655 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Average exposure per issuer (fair value) | 1,440,168 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 1,460,475 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
General Obligation Bonds [Member] | MISSOURI |  |
Note 2 - 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 | 11 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Amortized cost | 7,091,686 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 8,424,928 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Fair value | 7,085,546 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 8,426,047 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Average exposure per issuer (fair value) | 644,141 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 766,004 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
General Obligation Bonds [Member] | ILLINOIS |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 9 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 10 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Amortized cost | 11,925,483 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 22,447,799 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Fair value | 12,255,809 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 22,784,638 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Average exposure per issuer (fair value) | 1,361,757 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 2,278,464 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IL / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
General Obligation Bonds [Member] | Other States [Member] |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 35 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 42 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Amortized cost | 14,918,372 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 16,838,719 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Fair value | 15,295,418 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 17,110,831 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Average exposure per issuer (fair value) | 437,012 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 407,401 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
General Obligation Bonds [Member] |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 70 qcrh_NumberOfIssuers / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 77 qcrh_NumberOfIssuers / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Amortized cost | 55,366,866 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 67,868,415 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Fair value | 56,239,293 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 68,768,171 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Average exposure per issuer (fair value) | 803,418 qcrh_AverageExposurePerIssuerFairValue / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember | 893,093 qcrh_AverageExposurePerIssuerFairValue / us-gaap_InvestmentTypeAxis = qcrh_GeneralObligationBondsMember
Revenue Bonds [Member] | IOWA |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 25 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 20 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Amortized cost | 73,326,036 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 59,417,246 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 73,890,396 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 60,402,941 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | 2,955,616 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 3,020,147 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IA / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Revenue Bonds [Member] | MISSOURI |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 35 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 30 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Amortized cost | 66,627,817 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 62,358,276 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 66,749,366 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 62,584,516 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | 1,907,125 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 2,086,151 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_MO / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Revenue Bonds [Member] | Other States [Member] |  |
Note 2 - 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 = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 4 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Amortized cost | 9,740,846 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 8,295,311 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 9,923,138 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 8,449,900 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | 992,314 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 2,112,475 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = qcrh_OtherStatesMember / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Revenue Bonds [Member] | INDIANA |  |
Note 2 - 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_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 8 qcrh_NumberOfIssuers / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Amortized cost | 25,563,200 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 17,991,200 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 25,397,220 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 17,925,721 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | 2,308,838 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 2,240,715 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_IN / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Revenue Bonds [Member] | KANSAS |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 3 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 | 12,120,688 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 12,307,866 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 12,100,898 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 12,332,528 us-gaap_OtherInvestments / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | 4,033,633 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 6,166,264 qcrh_AverageExposurePerIssuerFairValue / invest_InvestmentGeographicRegionAxis = stpr_KS / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Revenue Bonds [Member] |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 84 qcrh_NumberOfIssuers / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 64 qcrh_NumberOfIssuers / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Amortized cost | 187,378,587 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 160,369,899 qcrh_MarketableSecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Fair value | 188,061,018 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | 161,695,606 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember
Average exposure per issuer (fair value) | $ 2,238,822 qcrh_AverageExposurePerIssuerFairValue / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember | $ 2,526,494 qcrh_AverageExposurePerIssuerFairValue / us-gaap_InvestmentTypeAxis = qcrh_RevenueBondsMember

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- Definition Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities not classified as available-for-sale, held-to-maturity, or trading. + References No definition available. + Details
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