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Note 17 - Regulatory Capital Requirements and Restrictions on Dividends - (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 security | Feb. 18, 2020 shares
The number of junior subordinated private placement debentures issued |  | 4 |
The number of junior subordinated private placement debentures assumed |  | 3 |
Outstanding shares (as a percent) | 5.00% |  |
Maximum |  |  |
Shares repurchased | shares |  |  | 800,000

X
- Definition Percentage of outstanding shares. + References No definition available. + Details
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Namespace Prefix: | qcrh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of private placement junior subordinated debentures assumed. + References No definition available. + Details
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Namespace Prefix: | qcrh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of private placement junior subordinated debentures issued. + References No definition available. + Details
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Namespace Prefix: | qcrh_
Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

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