The aggregate depreciation from amortized cost basis as a percent.

No definition available.

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

- Details

Name:	qcrh_Note2InvestmentSecuritiesDetailsLineItems
Namespace Prefix:	qcrh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of issuers of debt securities.

+ References

No definition available.

+ Details

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

- Definition

Number of securities.

+ References

No definition available.

+ Details

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

- Definition

Represents the number of states investments are held in.

+ References

No definition available.

+ Details

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

- Definition

The percentage of the companies investment portfolio by type of investment.

+ References

No definition available.

+ Details

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

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

+ Details

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

- Definition

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

+ Details

Name:	us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

No definition available.

+ Details

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

- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560

+ Details

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

- Definition

Other investments not otherwise specified in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 12

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph g

-Article 7

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(f,g))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

Note 2 - Investment Securities (Details) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended
Note 2 - Investment Securities (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Note 2 - Investment Securities (Details) [Line Items]
Number of Securities	505	505
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions				241
Aggregate Depreciation From Amortized Cost Basis, Percent		3.00%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	190	190
Available-for-sale Securities	$ 466,944,567	$ 466,944,567		$ 551,758,458
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	185,840,139	185,840,139		145,451,895
Number of Issuers	272	272		269
Municipal Bonds [Member] \| General Obligation Bonds [Member]
Note 2 - Investment Securities (Details) [Line Items]
Other Investments	63,200,000	63,200,000		54,200,000
Municipal Bonds [Member] \| Revenue Bonds [Member]
Note 2 - Investment Securities (Details) [Line Items]
Other Investments	153,000,000	153,000,000		119,300,000
Equity Securities [Member]
Note 2 - Investment Securities (Details) [Line Items]
Percentage of Investment Portfolio		1.00%		1.00%
Other than Temporary Impairment Losses, Investments	0	0	0
Debt Securities [Member]
Note 2 - Investment Securities (Details) [Line Items]
Other than Temporary Impairment Losses, Investments	0	0	0
US States and Political Subdivisions Debt Securities [Member]
Note 2 - Investment Securities (Details) [Line Items]
Available-for-sale Securities	31,260,146	31,260,146		35,958,857
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	184,790,139	184,790,139		144,401,895
Aggregate Fair Value Exceeding $5 Million [Member] \| General Obligation Bonds [Member]
Note 2 - Investment Securities (Details) [Line Items]
Number of States Investments Held In	3	3		2
Aggregate Fair Value Exceeding $5 Million [Member] \| Revenue Bonds [Member]
Note 2 - Investment Securities (Details) [Line Items]
Number of States Investments Held In	4	4		4
General Obligation Bonds [Member] \| Minimum [Member]
Note 2 - Investment Securities (Details) [Line Items]
Other Investments	5,000,000	5,000,000		5,000,000
General Obligation Bonds [Member]
Note 2 - Investment Securities (Details) [Line Items]
Number of States Investments Held In	19	19		20
Revenue Bonds [Member] \| Minimum [Member]
Note 2 - Investment Securities (Details) [Line Items]
Other Investments	$ 5,000,000	$ 5,000,000		$ 5,000,000
Revenue Bonds [Member]
Note 2 - Investment Securities (Details) [Line Items]
Number of States Investments Held In	8	8		8