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NOTE 7 - BUSINESS SEGMENT INFORMATION - (Details) $ in Thousands | Mar. 31, 2020 USD ($) subsidiary
--- | ---
Number of subsidiaries commercial banks | 4
Commercial Banking |
Number of subsidiaries commercial banks | 4
Wealth Management Segment [Member] |
Assets allocated | $ | $ 0

X
- Definition The amount of assets of subsidiary banks allocated to other segments. + References No definition available. + Details
Name: | qcrh_AssetsOfSubsidiaryBanksAllocated
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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: |

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