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Note 13 - COMMITMENTS (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
CSB facility
COMMITMENTS
Contract price for construction of new facility		$ 41.3
Construction payment for new facility	$ 28.7
Construction remaining future commitment	12.6
New company and QCBT facility
COMMITMENTS
Contract price for construction of new facility	66.5
Construction payment for new facility	2.7
Construction remaining future commitment	$ 63.8

X

- Definition

The amount of contract price that was paid.

+ References

No definition available.

+ Details

Name:	qcrh_ConstructionCommitmentPaymentMade
Namespace Prefix:	qcrh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of contract price remaining for future payment consisting of work plus fee payable under construction commitment.

+ References

No definition available.

+ Details

Name:	qcrh_ConstructionCommitmentRemainingFutureCommitment
Namespace Prefix:	qcrh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=qcrh_CsbFacilityInAnkenyIowaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=qcrh_NewCompanyAndQcbtFacilityInBettendorfIowaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: