Note 4 - LOANS LEASES RECEIVABLE - Aging of the Loan Lease Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accruing Past Due 90 Days or More	$ 268
Loans and leases	$ 5,797,903	$ 4,680,132
Accruing past due 90 days or more as a percentage of total loan/lease portfolio	0.00%
Loans and leases as a percentage of total loan/lease portfolio	100.00%	100.00%
C&I - revolving
Loans and leases		$ 248,483
C&I - other
Loans and leases		1,346,602
Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases		421,701
CRE - non owner occupied
Loans and leases		646,500
Current
Loan	$ 5,769,214	$ 4,666,986
Current as a percentage of total loan/lease portfolio	99.51%	99.57%
Current \| C&I - revolving
Loan		$ 248,483
Current \| C&I - other
Loan		1,337,034
Current \| Owner Occupied Commercial Real Estate Loans [Member]
Loan		421,701
Current \| CRE - non owner occupied
Loan		646,500
Financing Receivables, 30 to 59 Days Past Due [Member]
Loan	$ 3,495	$ 2,202
Past due as a percentage of total loan/lease portfolio	0.06%	0.05%
Financing Receivables, 30 to 59 Days Past Due [Member] \| C&I - other
Loan		$ 859
Financing Receivables, 60 to 89 Days Past Due [Member]
Loan	$ 1,352	$ 8,184
Past due as a percentage of total loan/lease portfolio	0.02%	0.17%
Financing Receivables, 60 to 89 Days Past Due [Member] \| C&I - other
Loan		$ 7,308
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accruing Past Due 90 Days or More		$ 1
Accruing past due 90 days or more as a percentage of total loan/lease portfolio		0.00%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| C&I - other
Accruing Past Due 90 Days or More		$ 1
Past Due
Nonaccrual Loans/Leases	$ 23,574	$ 2,759
Nonaccrual Loans/Leases as a percentage of total loan/lease portfolio	0.41%	0.06%
Past Due \| C&I - other
Nonaccrual Loans/Leases		$ 1,400
Commercial Portfolio Segment [Member]
Loans and leases	$ 1,725,947	1,595,085
Commercial Portfolio Segment [Member] \| C&I - revolving
Loans and leases	322,258	248,483
Commercial Portfolio Segment [Member] \| C&I - other
Accruing Past Due 90 Days or More	1
Loans and leases	1,403,689	1,346,602
Commercial Portfolio Segment [Member] \| Current \| C&I - revolving
Loan	322,258
Commercial Portfolio Segment [Member] \| Current \| C&I - other
Loan	1,397,799
Commercial Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| C&I - other
Loan	3,136
Commercial Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| C&I - other
Loan	1,038
Commercial Portfolio Segment [Member] \| Past Due \| C&I - other
Nonaccrual Loans/Leases	1,715
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	628,565
Commercial Real Estate Portfolio Segment [Member] \| CRE - non owner occupied
Loans and leases	889,530	646,500
Commercial Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Loans and leases	1,080,372	918,571
Commercial Real Estate Portfolio Segment [Member] \| Current \| Owner Occupied Commercial Real Estate Loans [Member]
Loan	626,209
Commercial Real Estate Portfolio Segment [Member] \| Current \| CRE - non owner occupied
Loan	882,587
Commercial Real Estate Portfolio Segment [Member] \| Past Due \| Owner Occupied Commercial Real Estate Loans [Member]
Nonaccrual Loans/Leases	2,356
Commercial Real Estate Portfolio Segment [Member] \| Past Due \| CRE - non owner occupied
Nonaccrual Loans/Leases	6,943
Construction and Land Development [Member] \| Construction Loans [Member]
Loans and leases	1,080,372	918,571
Construction and Land Development [Member] \| Current \| Construction Loans [Member]
Loan	1,071,748	918,498
Construction and Land Development [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Construction Loans [Member]
Loan	63
Construction and Land Development [Member] \| Past Due \| Construction Loans [Member]
Nonaccrual Loans/Leases	8,561	73
Multi-family
Loans and leases	860,742	600,412
Multi-family \| Current
Loan	860,742	600,412
Direct financing leases
Loans and leases	40,050	45,191
Direct financing leases \| Current
Loan	38,940	44,174
Direct financing leases \| Financing Receivables, 30 to 59 Days Past Due [Member]
Loan	213	10
Direct financing leases \| Financing Receivables, 60 to 89 Days Past Due [Member]
Loan	43	160
Direct financing leases \| Past Due
Nonaccrual Loans/Leases	854	847
1-4 family real estate
Accruing Past Due 90 Days or More	267
Loans and leases	473,141	377,361
1-4 family real estate \| Current
Loan	469,737	374,912
1-4 family real estate \| Financing Receivables, 30 to 59 Days Past Due [Member]
Loan	96	1,325
1-4 family real estate \| Financing Receivables, 60 to 89 Days Past Due [Member]
Loan	165	716
1-4 family real estate \| Past Due
Nonaccrual Loans/Leases	2,876	408
Consumer
Loans and leases	99,556	75,311
Consumer \| Current
Loan	99,194	75,272
Consumer \| Financing Receivables, 30 to 59 Days Past Due [Member]
Loan	50	8
Consumer \| Financing Receivables, 60 to 89 Days Past Due [Member]
Loan	43
Consumer \| Past Due
Nonaccrual Loans/Leases	$ 269	$ 31

Reflects the percentage derived from dividing loans accruing past due 90 days or more by total loans.

No definition available.

Name:	qcrh_PercentageOfAccruingPastDue90DaysOrMoreToTotalLoanLeasePortfolio
Namespace Prefix:	qcrh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Reflects the percentage derived from dividing current loans by total loans.

+ References

No definition available.

+ Details

Name:	qcrh_PercentageOfCurrentLoansToTotalLoanLeasePortfolio
Namespace Prefix:	qcrh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Reflects the percentage derived from dividing nonaccrual loans by total loans.

+ References

No definition available.

+ Details

Name:	qcrh_PercentageOfNonaccrualLoansToTotalLoanLeasePortfolio
Namespace Prefix:	qcrh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Reflects the percentage derived from dividing past due loans by total loans.

+ References

No definition available.

+ Details

Name:	qcrh_PercentageOfPastDueLoansToTotalLoanLeasePortfolio
Namespace Prefix:	qcrh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of financing receivable 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of financing receivable on nonaccrual status.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

+ Details

Name:	us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (1)

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1404
-Paragraph (a)

+ Details

Name:	us-gaap_NotesReceivableGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=qcrh_CommercialAndIndustrialRevolvingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=qcrh_CommercialAndIndustrialOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=qcrh_OwnerOccupiedCommercialRealEstateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=qcrh_CommercialRealEstateNonOwnerOccupiedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=srt_MultifamilyMember
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_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: