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Note 11 - Other Borrowings and Unused Lines of Credit - Summary of Prepayments of Wholesale Structured Repurchase Agreements (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amount				$ 69,769,000	$ 34,559,000
Whole sale Repurchase Agreements [Member]
Amount	$ 55,000,000	$ 10,000,000		$ 65,000,000
Weighted Average Interest Rate	3.27%	3.97%		3.38%
Prepayment Fees	$ 4,010,000	$ 759,000		$ 4,769,000

X

- Definition

The weighted average interest rate of debt instrument that paid prior to maturity during the period.

+ References

No definition available.

+ Details

Name:	qcrh_DebtInstrumentPrepaymentWeightedAverageInterestRate
Namespace Prefix:	qcrh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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

X

- Definition

Amount of cash outflow for the payment of debt classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

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

X

- Details

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