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Note 4 - Loans/Leases Receivable - Changes in the ACL for OBS exposures (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Balance, beginning | $ 87,706 | $ 78,721 |
Provisions (credited) to expense | 11,550 | 9,636 | $ 5,702
Balance, ending | 87,200 | 87,706 | 78,721
Unfunded Loan Commitment |  |  |
Balance, beginning | 5,552 | 6,886 |
Provisions (credited) to expense | 3,977 | (1,334) |
Balance, ending | $ 9,529 | $ 5,552 | $ 6,886

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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |