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Note 4 - Loans/Leases Receivable - Concentration by Industries (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Loan | $ 6,543,416 | $ 6,138,871
Lessors of Non-residential Buildings [Member] |  |
Loan | $ 673,719 | $ 558,719
Percentage of total loans/leases | 10.00% | 9.00%
Lessors of Residential Buildings [Member] |  |
Loan | $ 2,328,875 | $ 2,168,431
Percentage of total loans/leases | 36.00% | 35.00%

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- Definition Amortized cost includes net investment in lease excluding accrued interest, before allowance for credit loss, of financing receivable. + References No definition available. + Details
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Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The percentage of total loan leases. + References No definition available. + Details
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Namespace Prefix: | qcrh_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=qcrh_LessorsOfResidentialBuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |