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Note 23 - Business Segment Information - (Details) | Dec. 31, 2020 subsidiary
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Number of subsidiaries commercial banks | 4
Commercial Banking |
Number of subsidiaries commercial banks | 4

X
- 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

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