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Note 3 - LOANS/LEASES RECEIVABLE - Adoption of ASU 2016-13 (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Balance, beginning | $ 85,797 | $ 92,425 | $ 87,706 | $ 78,721
Provisions (credited) to expense | 3,260 | 331 | 9,031 | 8,623
Balance, ending | 87,669 | 90,489 | 87,669 | 90,489
Guaranty Bank |  |  |  |
Provisions (credited) to expense |  | 11,000 |  | 11,000
Unfunded Loan Commitment |  |  |  |
Balance, beginning | 6,326 | 6,878 | 5,552 | 6,886
Provisions (credited) to expense | 546 | (331) | 1,320 | (339)
Balance, ending | $ 6,872 | $ 6,547 | $ 6,872 | $ 6,547

X
- Definition Amount includes investment in lease, excluding accrued interest, of allowance for credit loss on financing receivable. + References No definition available. + Details
Name: | qcrh_FinancingReceivableAndNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable and net investment in lease. + References No definition available. + Details
Name: | qcrh_FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=qcrh_GuarantyBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |