No definition available.

Name:	qcrh_Note25SubsequentEventJuniorSubordinatedDebenturesRetirementandBalanceSheetRestructuringDetailsLineItems
Namespace Prefix:	qcrh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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

- Definition

States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: 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=56944662&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for the payment of loan drawn from Federal Home Loan.

+ 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=56944662&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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

- Definition

The cash outflow for the payment of other borrowing not otherwise defined in the taxonomy.

+ References

+ Details

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

- Definition

Weighted average interest rate of short-term debt outstanding.

+ References

+ Details

Name:	us-gaap_ShortTermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=qcrh_WholesaleRepurchaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ExtinguishmentOfDebtAxis=us-gaap_JuniorSubordinatedDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubordinatedBorrowingAxis=qcrh_NotePayableToQCRHoldingsCapitalTrustIVMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ExtinguishmentOfDebtAxis=qcrh_FHLBAdvancesAndWholesaleRepurchaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ExtinguishmentOfDebtAxis=qcrh_WholesaleRepurchaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) - USD ($)	1 Months Ended	3 Months Ended			12 Months Ended
	Jan. 31, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) [Line Items]
Extinguishment of Debt, Amount				$ 103,500,000
Gains (Losses) on Extinguishment of Debt			$ 209,416	(6,900,000)
Debt Instrument, Basis Spread on Variable Rate					3.10%
Debt Instrument, Interest Rate, Effective Percentage			2.60%		2.60%	2.50%
Repayments of Other Debt					$ 34,559,000
Repayments of Federal Home Loan Bank Borrowings			$ 3,000,000	75,500,000	84,401,601	$ 0
Subsequent Event [Member]
Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) [Line Items]
Repayments of Federal Home Loan Bank Borrowings	$ 10,000,000
Wholesale Repurchase Agreements [Member]
Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) [Line Items]
Gains (Losses) on Extinguishment of Debt			$ 382,000	(1,202,000)
Repayments of Other Debt				$ 10,000,000	$ 5,000,000
Wholesale Repurchase Agreements [Member] \| Subsequent Event [Member]
Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) [Line Items]
Repayments of Other Debt	$ 10,000,000
Weighted Average [Member] \| Subsequent Event [Member]
Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End	3.92%
Junior Subordinated Debt [Member] \| Subsequent Event [Member] \| Note Payable to QCR Holdings Capital Trust IV [Member]
Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) [Line Items]
Extinguishment of Debt, Amount	$ 5,100,000
Gains (Losses) on Extinguishment of Debt	$ 1,200,000
Debt Instrument, Interest Rate, Effective Percentage	2.42%
Junior Subordinated Debt [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate					2.85%
Junior Subordinated Debt [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Subsequent Event [Member] \| Note Payable to QCR Holdings Capital Trust IV [Member]
Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.80%
FHLB Advances and Wholesale Repurchase Agreements [Member] \| Subsequent Event [Member]
Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) [Line Items]
Gains (Losses) on Extinguishment of Debt		$ (1,300,000)
FHLB Advances and Wholesale Repurchase Agreements [Member] \| Weighted Average [Member] \| Subsequent Event [Member]
Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) [Line Items]
Debt Instrument, Term		2 years 62 days
Wholesale Repurchase Agreements [Member] \| Subsequent Event [Member]
Note 25 - Subsequent Event - Junior Subordinated Debentures Retirement and Balance Sheet Restructuring (Details) [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Two		$ 10,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three		$ 10.0
Short-term Debt, Weighted Average Interest Rate		0.50%