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Note 9 - Short-term Borrowings - Overnight Repurchase Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Repurchase Agreements with Customers [Member] |  |
Average daily balance | $ 1,495 | $ 4,231
Average daily interest rate | 0.40% | 0.73%
Maximum month-end balance | $ 2,377 | $ 4,177
Weighted average rate as of December 31 |  | 1.00%
Federal Funds Purchased [Member] |  |
Average daily balance | $ 19,573 | $ 12,594
Average daily interest rate | 0.36% | 2.56%
Maximum month-end balance | $ 30,430 | $ 17,010
Weighted average rate as of December 31 | 0.06% | 1.50%

X
- Definition Represents the average daily balance during the period. + References No definition available. + Details
Name: | qcrh_AverageDailyBalanceDuringThePeriod
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the average daily interest rate during the period. + References No definition available. + Details
Name: | qcrh_AverageDailyInterestRateDuringThePeriod
Namespace Prefix: | qcrh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents information about the maximum month end balance during the period. + References No definition available. + Details
Name: | qcrh_MaximumMonthEndBalanceDuringThePeriod
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=qcrh_RepurchaseAgreementsWithCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_FederalFundsPurchasedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |