Note 4 - LOANS LEASES RECEIVABLE - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022 USD ($) item loan	Jun. 30, 2021 USD ($) loan	Jun. 30, 2022 USD ($) loan item	Jun. 30, 2021 USD ($) loan
Number of loans restructured \| item	0		0
Number of Loans / Leases \| loan		3		3
Pre-Modification Recorded Investment		$ 2,599		$ 2,599
Post-Modification Recorded Investment		2,599		2,599
Specific Allowance		$ 189		$ 189
Interest Rate Adjusted Below Market
Number of Loans / Leases \| loan		2		2
Pre-Modification Recorded Investment		$ 67		$ 67
Post-Modification Recorded Investment		67		67
Specific Allowance		$ 7		$ 7
Direct financing leases \| Payment Deferral [Member]
Number of Loans / Leases \| loan	1		1
Pre-Modification Recorded Investment	$ 51		$ 51
Post-Modification Recorded Investment	$ 51		$ 51
1-4 family real estate \| Interest Rate Adjusted Below Market
Number of Loans / Leases \| loan		1		1
Pre-Modification Recorded Investment		$ 54		$ 54
Post-Modification Recorded Investment		54		54
Specific Allowance		$ 6		$ 6
Consumer \| Extended Maturity [Member]
Number of Loans / Leases \| loan		1		1
Pre-Modification Recorded Investment		$ 2,532		$ 2,532
Post-Modification Recorded Investment		2,532		2,532
Specific Allowance		$ 182		$ 182
Consumer \| Interest Rate Adjusted Below Market
Number of Loans / Leases \| loan		1		1
Pre-Modification Recorded Investment		$ 13		$ 13
Post-Modification Recorded Investment		13		13
Specific Allowance		$ 1		$ 1

Specific allowance of amount of investment in financing receivables modified by troubled debt restructurings.

No definition available.

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

- Definition

The number of loans restructured during the period.

+ References

No definition available.

+ Details

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

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=qcrh_InterestRateAdjustedBelowMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_FinanceLeasesPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=qcrh_OneToFourFamilyRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: