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Note 18 - Commitments and Contingencies (Details) (USD $)
1 Months Ended
Apr. 30, 2011
Dec. 31, 2013
Dec. 31, 2014
May 13, 2013
Note 18 - Commitments and Contingencies (Details) [Line Items]        
Disposal Group, Including Discontinued Operation, Mortgage Loans   $ 1,358,290us-gaap_LoansHeldForSaleMortgages $ 553,000us-gaap_LoansHeldForSaleMortgages  
Loans Sold with Recourse Provisions   16,151,133qcrh_LoansSoldWithRecourseProvisions 9,049,519qcrh_LoansSoldWithRecourseProvisions  
Cash, Uninsured Amount   54,163,895us-gaap_CashUninsuredAmount 101,602,829us-gaap_CashUninsuredAmount  
Money Market Funds, at Carrying Value   78,880,300us-gaap_MoneyMarketFundsAtCarryingValue 89,006,285us-gaap_MoneyMarketFundsAtCarryingValue  
Commitments to Extend Credit [Member]        
Note 18 - Commitments and Contingencies (Details) [Line Items]        
Other Commitment   432,601,000us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
499,267,717us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
 
Unjust Enrichment Case [Member] | Community National Bancorporation and Community National Bank [Member]        
Note 18 - Commitments and Contingencies (Details) [Line Items]        
Business Combination, Contingent Consideration, Liability       1,028,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= qcrh_CommunityNationalBancorporationAndCommunityNationalBankMember
/ us-gaap_LitigationCaseAxis
= qcrh_UnjustEnrichmentCaseMember
Unjust Enrichment Case [Member] | Community National Bancorporation and Community National Bank [Member]        
Note 18 - Commitments and Contingencies (Details) [Line Items]        
Loss Contingency, Number of Defendants 1us-gaap_LossContingencyNumberOfDefendants
/ dei_LegalEntityAxis
= qcrh_CommunityNationalBancorporationAndCommunityNationalBankMember
/ us-gaap_LitigationCaseAxis
= qcrh_UnjustEnrichmentCaseMember
     
Unjust Enrichment Case [Member]        
Note 18 - Commitments and Contingencies (Details) [Line Items]        
Loss Contingency, Number of Defendants 36us-gaap_LossContingencyNumberOfDefendants
/ us-gaap_LitigationCaseAxis
= qcrh_UnjustEnrichmentCaseMember
     
Litigation Settlement, Amount   940,333us-gaap_LitigationSettlementAmount
/ us-gaap_LitigationCaseAxis
= qcrh_UnjustEnrichmentCaseMember
   
Standby Letters of Credit [Member]        
Note 18 - Commitments and Contingencies (Details) [Line Items]        
Other Commitment   $ 9,697,000us-gaap_OtherCommitment
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
$ 12,896,428us-gaap_OtherCommitment
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember