The amount of nonaccretable discount recognized due to repayment of purchased loans where credit was impaired.

No definition available.

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Balance Type:	debit
Period Type:	duration

- Definition

The number of months of contractual life of a loan remaining.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

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- 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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

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

- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

+ References

+ Details

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

- Definition

Amount of increase (decrease) of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans accounted for as debt securities, with evidence of deterioration of credit quality.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544

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Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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

- Details

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

- Details

Name:	us-gaap_BusinessAcquisitionAxis=qcrh_SpringfieldBancsharesMember
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Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=qcrh_FiveBranchLocationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=qcrh_TenBranchLocationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CoreDepositsMember
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Note 2 - Sales/Mergers/Acquisitions - Additional Information (Details) - USD ($)			12 Months Ended
	Jul. 01, 2018	Oct. 01, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Premises and equipment				$ 6,092,000	$ 4,808,000
Core deposit intangible				$ 10,064,000	2,698,000
PCI Loans
Business Acquisition [Line Items]
Remaining life of loan (in months)			8 months	8 months
Springfield Bancshares
Business Acquisition [Line Items]
Premises and equipment	$ 6,092
Core deposit intangible	$ 8,209
Springfield Bancshares \| PCI Loans
Business Acquisition [Line Items]
Nonaccretable discount recognized			$ 0	$ 0
Amount accreted to income			$ 153,000
Guaranty Bank and Trust Company [Member]
Business Acquisition [Line Items]
Premises and equipment		$ 4,808,000
Core deposit intangible		$ 2,698,000
Guaranty Bank and Trust Company [Member] \| PCI Loans
Business Acquisition [Line Items]
Nonaccretable discount recognized				$ 137,000	$ 158,000
Five Branch Locations [Member] \| Guaranty Bank and Trust Company [Member]
Business Acquisition [Line Items]
Property, plant and equipment, useful life		39 years
Ten Branch Locations [Member] \| Springfield Bancshares
Business Acquisition [Line Items]
Property, plant and equipment, useful life	39 years
Ten Branch Locations [Member] \| Guaranty Bank and Trust Company [Member]
Business Acquisition [Line Items]
Core deposit intangible		$ 4,600,000
Core Deposits [Member] \| Springfield Bancshares
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	10 years
Core deposit intangible	$ 8,200,000
Core Deposits [Member] \| Guaranty Bank and Trust Company [Member]
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		10 years