Note 3 - LOANS LEASES RECEIVABLE - Leases By Delinquency Status (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loans and leases	$ 4,827,868	$ 4,680,132
Delinquency Status [Member]
2022	133,146	245,701
2021	207,940	152,113
2020	127,794	66,802
2019	41,544	36,973
2018	20,831	19,169
Prior	53,351	46,979
Revolving Loans Amortized Cost Basis	53,541	55,759
Loans and leases	638,147	623,496
Nonperforming Financial Instruments [Member]
Loans and leases	2,748	2,760
C&I - other
Loans and leases		1,346,602
C&I - other \| Nonperforming Financial Instruments [Member]
Loans and leases	1,473	1,401
Commercial Portfolio Segment [Member]
Loans and leases	1,637,662	1,595,085
Commercial Portfolio Segment [Member] \| C&I - other
Loans and leases	1,374,221	1,346,602
Commercial Portfolio Segment [Member] \| C&I - other \| Delinquency Status [Member]
2022	90,552	117,258
2021	93,979	54,438
2020	37,745	34,034
2019	14,820	14,642
2018	4,689	4,242
Prior	755	469
Loans and leases	242,540	225,083
Commercial Portfolio Segment [Member] \| C&I - other \| Performing Loans
2022	90,552	117,163
2021	92,958	54,261
2020	37,588	33,390
2019	14,734	14,274
2018	4,689	4,200
Prior	755	455
Loans and leases	241,276	223,743
Commercial Portfolio Segment [Member] \| C&I - other \| Nonperforming Financial Instruments [Member]
2022		95
2021	1,021	177
2020	157	644
2019	86	368
2018		42
Prior		14
Loans and leases	1,264	1,340
Direct financing leases
Loans and leases	43,330	45,191
Direct financing leases \| Delinquency Status [Member]
2022	15,181	6,690
2021	7,336	12,862
2020	8,573	11,638
2019	6,874	9,287
2018	4,093	3,713
Prior	1,273	1,001
Loans and leases	43,330	45,191
Direct financing leases \| Performing Loans
2022	15,181	6,690
2021	6,535	12,130
2020	8,554	11,638
2019	6,874	9,235
2018	4,093	3,695
Prior	1,273	956
Loans and leases	42,510	44,344
Direct financing leases \| Nonperforming Financial Instruments [Member]
2021	801	732
2020	19
2019		52
2018		18
Prior		45
Loans and leases	820	847
Construction and Land Development [Member] \| Construction Loans [Member]
Loans and leases	863,116	918,571
Construction and Land Development [Member] \| Construction Loans [Member] \| Delinquency Status [Member]
2022	5,626	12,857
2021	10,768	2,080
2020	707
2019		494
2018	484	73
Revolving Loans Amortized Cost Basis	160	280
Loans and leases	17,745	15,784
Construction and Land Development [Member] \| Construction Loans [Member] \| Performing Loans
2022	5,626	12,857
2021	10,768	2,080
2020	707
2019		494
2018	484
Revolving Loans Amortized Cost Basis	160	280
Loans and leases	17,745	15,711
Construction and Land Development [Member] \| Construction Loans [Member] \| Nonperforming Financial Instruments [Member]
2018		73
Loans and leases		73
1-4 family real estate
Loans and leases	379,613	377,361
1-4 family real estate \| Delinquency Status [Member]
2022		104,005
2021		78,713
2020		19,001
2019		10,890
2018		10,533
Prior		44,278
Revolving Loans Amortized Cost Basis		68
Loans and leases		267,488
1-4 family real estate \| Performing Loans
2022		104,005
2021		78,713
2020		19,001
2019		10,784
2018		10,533
Prior		43,976
Revolving Loans Amortized Cost Basis		68
Loans and leases		267,080
1-4 family real estate \| Nonperforming Financial Instruments [Member]
2019		106
Prior		302
Loans and leases	425	408
1-4 family real estate \| One To Four Family [Member] \| Delinquency Status [Member]
2022	19,739
2021	92,023
2020	77,036
2019	18,020
2018	10,105
Prior	49,818
Revolving Loans Amortized Cost Basis	74
Loans and leases	266,815
1-4 family real estate \| One To Four Family [Member] \| Performing Loans
2022	19,739
2021	92,023
2020	77,036
2019	18,020
2018	10,009
Prior	49,489
Revolving Loans Amortized Cost Basis	74
Loans and leases	266,390
1-4 family real estate \| One To Four Family [Member] \| Nonperforming Financial Instruments [Member]
2018	96
Prior	329
Loans and leases	425
Residential real estate \| Nonperforming Financial Instruments [Member]
Loans and leases		408
Consumer
Loans and leases	73,310	75,311
Consumer \| Delinquency Status [Member]
2022	2,048	4,891
2021	3,834	4,020
2020	3,733	2,129
2019	1,830	1,660
2018	1,460	608
Prior	1,505	1,231
Revolving Loans Amortized Cost Basis	53,307	55,411
Loans and leases	67,717	69,950
Consumer \| Performing Loans
2022	2,048	4,891
2021	3,834	4,020
2020	3,733	2,114
2019	1,816	1,660
2018	1,460	593
Prior	1,489	1,230
Revolving Loans Amortized Cost Basis	53,307	55,411
Loans and leases	67,687	69,919
Consumer \| Nonperforming Financial Instruments [Member]
2020		15
2019	14
2018		15
Prior	16	1
Loans and leases	$ 30	31
Installment and other consumer loans \| Nonperforming Financial Instruments [Member]
Loans and leases		$ 31

Amount of financing receivable originated more than five years prior to current fiscal year.

Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447

+ Details

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

- Definition

Amount of financing receivable originated four years prior to current fiscal year.

+ References

+ Details

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

- Definition

Amount of financing receivable originated in current fiscal year.

+ References

+ Details

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

- Definition

Amount of financing receivable originated in fiscal year prior to current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447

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

+ Details

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

- Definition

Amount of financing receivable originated three years prior to current fiscal year.

+ References

+ Details

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

- Definition

Amount of financing receivable originated two years prior to current fiscal year.

+ References

+ Details

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

- Definition

Amount of financing receivable that can be withdrawn, repaid and redrawn.

+ References

+ Details

Name:	us-gaap_FinancingReceivableRevolving
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

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=qcrh_DelinquencyStatusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
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_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_PerformingFinancingReceivableMember
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_ConstructionAndLandDevelopmentMember
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_OneToFourFamilyRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
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_FinancingReceivablePortfolioSegmentAxis=qcrh_InstallmentAndOtherConsumerLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: