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Note 13 - Junior Subordinated Debentures (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2022 USD ($) loan	Oct. 01, 2017 USD ($) loan	May 13, 2013 USD ($) loan
Junior Subordinated Debt
Repayment period (in years)	30 years
Community National
Number of assumed junior subordinated debentures | loan				2
Other borrowings | $				$ 4.2
Guaranty Bank and Trust Company
Number of assumed junior subordinated debentures | loan			1
Other borrowings | $			$ 3.9
Guaranty Federal Bancshares, Inc
Number of assumed junior subordinated debentures | loan		1
Other borrowings | $		$ 10.3

X

- Definition

The number of junior subordinated debentures assumed.

+ References

No definition available.

+ Details

Name:	qcrh_NumberOfJuniorSubordinatedDebenturesAssumed
Namespace Prefix:	qcrh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=qcrh_GuarantyBankAndTrustCompanyMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: