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Note 4 - Loans/Leases Receivable - Remaining Discount on Acquired loans (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at the beginning of the period | $ (1,533,000) | $ (3,139,000) | $ (6,435,000)
Discount added at acquisition | (13,381,000) |  |
Reclassification of nonaccretable discount to accretable |  |  | (530,000)
Reclassification of nonaccretable discount to allowance |  |  | 353,000
Accretion recognized | 8,826,000 | 1,606,000 | 3,473,000
Balance at the end of the period | $ (6,088,000) | (1,533,000) | (3,139,000)
Performing Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at the beginning of the period |  | $ (3,139,000) | (6,378,000)
Reclassification of nonaccretable discount to allowance |  |  | 353,000
Accretion recognized |  |  | 2,886,000
Balance at the end of the period |  |  | (3,139,000)
PCI Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at the beginning of the period |  |  | (57,000)
Reclassification of nonaccretable discount to accretable |  |  | (530,000)
Accretion recognized |  |  | $ 587,000

X
- Definition Change in the estimate of cash flows expected to be collected, after acquisition of a loan, which results in an increase in accretable yield (for example, if actual cash flows are significantly greater than previously expected). This relates to loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivables. + References No definition available. + Details
Name: | qcrh_FinancingReceivableAndNetInvestmentInLeaseCertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Change in the estimate of cash flows expected to be collected, after acquisition of a loan, which results in a decrease in accretable yield (for example, as a result of an other-than-temporary impairment). This relates to loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivables. + References No definition available. + Details
Name: | qcrh_FinancingReceivableAndNetInvestmentInLeaseCertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToNonaccretableDifference
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of accretion recognized on acquired loans. + References No definition available. + Details
Name: | qcrh_LoansAcquiredAccretionRecognized
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of accrued discount on acquired loans. + References No definition available. + Details
Name: | qcrh_LoansAcquiredAccruedDiscountOnAcquiredLoans
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of discount added at acquisition of acquired loans. + References No definition available. + Details
Name: | qcrh_LoansAcquiredDiscountAddedAtAcquisition
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |