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Note 14 - Employee Benefit Plans - Profit Sharing Contributions (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Retirement Benefits [Abstract] |  |  |
Matching contribution | $ 2,000,257 | $ 1,663,198 | $ 1,365,111

X
- Definition Defined contribution plan matching contribution. + References No definition available. + Details
Name: | qcrh_DefinedContributionPlanMatchingContribution
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration