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Note 2 - Community National Bancorporation and Community National Bank (Details) - Pro Forma Combined Operating Results (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Pro Forma Combined Operating Results [Abstract] |  |
Interest income | $ 83,008,255 qcrh_BusinessAcquisitionProFormaNetInterestIncome | $ 87,514,410 qcrh_BusinessAcquisitionProFormaNetInterestIncome
Noninterest income | 22,042,194 qcrh_BusinessAcquisitionProFormaNonInterestIncome | 19,792,383 qcrh_BusinessAcquisitionProFormaNonInterestIncome
Net income | 11,320,890 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | 14,077,018 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income attributable to QCR Holdings, Inc. common stockholders | $ 8,152,588 qcrh_BusinessAcquisitionNetIncomeLossAvailableToCommonStockholders | $ 10,092,460 qcrh_BusinessAcquisitionNetIncomeLossAvailableToCommonStockholders
Earnings per common share attributable to QCR Holdings, Inc. common stockholders |  |
Basic (in Dollars per share) | $ 1.47 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic | $ 1.82 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Diluted (in Dollars per share) | $ 1.44 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 1.79 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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