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Note 20 - Parent Company Only Financial Statements (Details) - Condensed Statements of Operations (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 14, 2013 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest income |  | $ 22,028,027 us-gaap_InterestIncomeOperating | $ 21,796,642 us-gaap_InterestIncomeOperating | $ 21,105,376 us-gaap_InterestIncomeOperating | $ 21,035,211 us-gaap_InterestIncomeOperating | $ 21,198,832 us-gaap_InterestIncomeOperating | $ 21,996,243 us-gaap_InterestIncomeOperating | $ 20,139,401 us-gaap_InterestIncomeOperating | $ 18,537,482 us-gaap_InterestIncomeOperating |  |  |  |  |  |
Bargain purchase gain on Community National acquisition | 1,841,385 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  |  |  |  |  |  |  |  |  |  | 1,841,385 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  |  |
Total income |  |  |  |  |  |  |  |  |  | 106,962,556 us-gaap_Revenues |  | 107,685,786 us-gaap_Revenues |  | 93,997,168 us-gaap_Revenues |
Interest expense |  | 4,246,814 us-gaap_InterestExpense | 4,321,311 us-gaap_InterestExpense | 4,140,033 us-gaap_InterestExpense | 4,185,970 us-gaap_InterestExpense | 4,303,100 us-gaap_InterestExpense | 4,685,907 us-gaap_InterestExpense | 4,431,349 us-gaap_InterestExpense | 4,346,165 us-gaap_InterestExpense | 16,894,128 us-gaap_InterestExpense |  | 17,766,521 us-gaap_InterestExpense |  | 19,726,613 us-gaap_InterestExpense |
Salaries and employee benefits |  |  |  |  |  |  |  |  |  | 40,337,055 us-gaap_LaborAndRelatedExpense |  | 37,510,318 us-gaap_LaborAndRelatedExpense |  | 33,274,509 us-gaap_LaborAndRelatedExpense |
Acquisition and data conversion costs |  |  |  |  |  |  |  |  |  |  |  | 2,353,162 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  |
Income tax benefit |  | (344,497)us-gaap_IncomeTaxExpenseBenefit | (1,028,876)us-gaap_IncomeTaxExpenseBenefit | (1,193,312)us-gaap_IncomeTaxExpenseBenefit | (472,285)us-gaap_IncomeTaxExpenseBenefit | (608,138)us-gaap_IncomeTaxExpenseBenefit | (1,038,793)us-gaap_IncomeTaxExpenseBenefit | (1,857,091)us-gaap_IncomeTaxExpenseBenefit | (1,113,920)us-gaap_IncomeTaxExpenseBenefit | (3,038,970)us-gaap_IncomeTaxExpenseBenefit |  | (4,617,942)us-gaap_IncomeTaxExpenseBenefit |  | (4,534,601)us-gaap_IncomeTaxExpenseBenefit |
Net income |  | 2,992,821 us-gaap_NetIncomeLoss | 4,062,665 us-gaap_NetIncomeLoss | 4,007,836 us-gaap_NetIncomeLoss | 3,889,215 us-gaap_NetIncomeLoss | 3,815,926 us-gaap_NetIncomeLoss | 3,811,944 us-gaap_NetIncomeLoss | 4,045,231 us-gaap_NetIncomeLoss | 3,265,144 us-gaap_NetIncomeLoss | 14,952,537 us-gaap_NetIncomeLoss |  | 14,938,245 us-gaap_NetIncomeLoss |  | 12,617,767 us-gaap_NetIncomeLoss |
Bank Subsidiaries [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  |  | 20,333,194 us-gaap_IncomeLossFromEquityMethodInvestments / invest_InvestmentAxis = qcrh_BankSubsidiariesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 20,499,070 us-gaap_IncomeLossFromEquityMethodInvestments / invest_InvestmentAxis = qcrh_BankSubsidiariesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 17,206,086 us-gaap_IncomeLossFromEquityMethodInvestments / invest_InvestmentAxis = qcrh_BankSubsidiariesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Nonbank Subsidiaries [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  |  | 32,675 us-gaap_IncomeLossFromEquityMethodInvestments / invest_InvestmentAxis = qcrh_NonbankSubsidiariesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 31,540 us-gaap_IncomeLossFromEquityMethodInvestments / invest_InvestmentAxis = qcrh_NonbankSubsidiariesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 168,934 us-gaap_IncomeLossFromEquityMethodInvestments / invest_InvestmentAxis = qcrh_NonbankSubsidiariesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest income |  |  |  |  |  |  |  |  |  | 40,815 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 43,476 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 57,136 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Bargain purchase gain on Community National acquisition |  |  |  |  |  |  |  |  |  |  |  | 1,841,385 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other * |  |  |  |  |  |  |  |  |  | 7,486 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | [1] | 7,942 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | [1] | 657,733 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | [1]
Total income |  |  |  |  |  |  |  |  |  | 20,414,170 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 22,423,413 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 18,089,889 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Interest expense |  |  |  |  |  |  |  |  |  | 1,986,752 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1,714,814 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1,408,948 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Salaries and employee benefits |  |  |  |  |  |  |  |  |  | 4,671,719 us-gaap_LaborAndRelatedExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 4,765,762 us-gaap_LaborAndRelatedExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 4,717,609 us-gaap_LaborAndRelatedExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Professional fees |  |  |  |  |  |  |  |  |  | 1,100,714 us-gaap_ProfessionalFees / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 977,571 us-gaap_ProfessionalFees / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 988,306 us-gaap_ProfessionalFees / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Acquisition and data conversion costs |  |  |  |  |  |  |  |  |  |  |  | 2,037,684 us-gaap_BusinessCombinationAcquisitionRelatedCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other-than-temporary impairment losses on securities |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,400 us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Other |  |  |  |  |  |  |  |  |  | 635,081 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 642,044 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 760,618 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Total expenses |  |  |  |  |  |  |  |  |  | 8,394,266 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 10,137,875 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 7,937,881 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Income before income tax benefit |  |  |  |  |  |  |  |  |  | 12,019,904 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 12,285,538 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 10,152,008 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Income tax benefit |  |  |  |  |  |  |  |  |  | 2,932,633 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 2,652,707 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 2,465,759 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net income |  |  |  |  |  |  |  |  |  | $ 14,952,537 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | $ 14,938,245 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | $ 12,617,767 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
[1] | The year ended December 31, 2012 includes pre-tax gain of approximately $580 thousand on the sale of a 2.25% equity interest in a company providing data processing services to merchant credit card acquiring businesses.

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6571-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6527-128477 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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