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NOTE 8 - BUSINESS SEGMENT INFORMATION - (Details) | Mar. 31, 2021 subsidiary
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Number of subsidiaries commercial banks | 4
Commercial Banking |
Number of subsidiaries commercial banks | 4

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- Definition Represents the number of subsidiaries. + References No definition available. + Details
Name: | qcrh_NumberOfSubsidiaries
Namespace Prefix: | qcrh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=qcrh_CommercialBankingSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |