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Note 22 - Business Segment Information (Details) - Selected Financial Information on the Company’s Business Segments (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | $ 106,962,556 us-gaap_Revenues | $ 107,685,786 us-gaap_Revenues | $ 93,997,168 us-gaap_Revenues
Net interest income | 17,781,213 us-gaap_InterestIncomeExpenseNet | 17,475,331 us-gaap_InterestIncomeExpenseNet | 16,965,343 us-gaap_InterestIncomeExpenseNet | 16,849,241 us-gaap_InterestIncomeExpenseNet | 16,895,732 us-gaap_InterestIncomeExpenseNet | 17,310,336 us-gaap_InterestIncomeExpenseNet | 15,708,052 us-gaap_InterestIncomeExpenseNet | 14,191,317 us-gaap_InterestIncomeExpenseNet | 69,071,128 us-gaap_InterestIncomeExpenseNet | 64,105,437 us-gaap_InterestIncomeExpenseNet | 57,649,260 us-gaap_InterestIncomeExpenseNet
Net income attributable to QCR Holdings, Inc. | 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
Total assets | 2,524,958,100 us-gaap_Assets |  |  |  | 2,394,952,924 us-gaap_Assets |  |  |  | 2,524,958,100 us-gaap_Assets | 2,394,952,924 us-gaap_Assets | 2,093,730,492 us-gaap_Assets
Provision for loan/lease losses | 3,647,636 us-gaap_ProvisionForLoanAndLeaseLosses | 1,063,323 us-gaap_ProvisionForLoanAndLeaseLosses | 1,001,879 us-gaap_ProvisionForLoanAndLeaseLosses | 1,094,162 us-gaap_ProvisionForLoanAndLeaseLosses | 1,985,517 us-gaap_ProvisionForLoanAndLeaseLosses | 1,366,984 us-gaap_ProvisionForLoanAndLeaseLosses | 1,520,137 us-gaap_ProvisionForLoanAndLeaseLosses | 1,057,782 us-gaap_ProvisionForLoanAndLeaseLosses | 6,807,000 us-gaap_ProvisionForLoanAndLeaseLosses | 5,930,420 us-gaap_ProvisionForLoanAndLeaseLosses | 4,370,767 us-gaap_ProvisionForLoanAndLeaseLosses
Goodwill | 3,222,688 us-gaap_Goodwill |  |  |  | 3,222,688 us-gaap_Goodwill |  |  |  | 3,222,688 us-gaap_Goodwill | 3,222,688 us-gaap_Goodwill | 3,222,688 us-gaap_Goodwill
Core deposit intangible | 1,670,921 us-gaap_FiniteLivedIntangibleAssetsNet |  |  |  | 1,870,433 us-gaap_FiniteLivedIntangibleAssetsNet |  |  |  | 1,670,921 us-gaap_FiniteLivedIntangibleAssetsNet | 1,870,433 us-gaap_FiniteLivedIntangibleAssetsNet |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | (456,646)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (402,040)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (379,946)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Net income attributable to QCR Holdings, Inc. |  |  |  |  |  |  |  |  |  |  | (10,752)us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Total assets | (7,233,390)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |  |  | (16,168,205)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |  |  | (7,233,390)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (16,168,205)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (38,008,739)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Quad City Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 48,542,678 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 48,742,635 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 47,984,123 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember
Net interest income |  |  |  |  |  |  |  |  | 36,539,635 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 33,892,035 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 33,770,092 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember
Net income attributable to QCR Holdings, Inc. |  |  |  |  |  |  |  |  | 9,065,183 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 9,310,779 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 9,915,267 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember
Total assets | 1,320,684,456 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember |  |  |  | 1,245,128,136 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember |  |  |  | 1,320,684,456 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 1,245,128,136 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 1,177,294,502 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember
Provision for loan/lease losses |  |  |  |  |  |  |  |  | 3,800,667 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 3,391,406 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 1,527,767 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember
Goodwill | 3,222,688 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember |  |  |  | 3,222,688 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember |  |  |  | 3,222,688 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 3,222,688 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember | 3,222,688 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = qcrh_QuadCityBankAndTrustCompanyMember
Cedar Rapids Bank and Trust [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 35,683,917 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember | 36,089,448 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember | 26,697,921 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember
Net interest income |  |  |  |  |  |  |  |  | 24,215,815 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember | 22,239,329 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember | 15,717,038 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember
Net income attributable to QCR Holdings, Inc. |  |  |  |  |  |  |  |  | 7,562,252 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember | 7,953,230 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember | 5,786,446 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember
Total assets | 840,331,777 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember |  |  |  | 804,223,453 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember |  |  |  | 840,331,777 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember | 804,223,453 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember | 625,713,218 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember
Provision for loan/lease losses |  |  |  |  |  |  |  |  | 1,855,333 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember | 1,531,014 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember | 1,275,000 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember
Core deposit intangible | 1,670,921 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember |  |  |  | 1,870,433 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember |  |  |  | 1,670,921 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember | 1,870,433 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_CedarRapidsBankAndTrustMember |
Rockford Bank and Trust [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 14,598,307 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember | 13,809,593 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember | 12,955,951 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember
Net interest income |  |  |  |  |  |  |  |  | 10,261,615 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember | 9,645,411 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember | 9,630,481 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember
Net income attributable to QCR Holdings, Inc. |  |  |  |  |  |  |  |  | 2,149,676 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember | 1,855,672 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember | 857,610 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember
Total assets | 353,448,134 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember |  |  |  | 339,375,139 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember |  |  |  | 353,448,134 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember | 339,375,139 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember | 313,824,607 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember
Provision for loan/lease losses |  |  |  |  |  |  |  |  | 1,151,000 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember | 1,008,000 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember | 1,568,000 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = qcrh_RockfordBankAndTrustMember
Wealth Management [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 8,513,322 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_WealthManagementMember | 7,521,821 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_WealthManagementMember | 5,993,437 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_WealthManagementMember
Net income attributable to QCR Holdings, Inc. |  |  |  |  |  |  |  |  | 1,556,082 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_WealthManagementMember | 1,379,402 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_WealthManagementMember | 646,762 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_WealthManagementMember
All Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 80,978 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember | 1,924,329 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember | 745,682 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember
Net interest income |  |  |  |  |  |  |  |  | (1,945,937)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember | (1,671,338)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember | (1,468,351)us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember
Net income attributable to QCR Holdings, Inc. |  |  |  |  |  |  |  |  | (5,380,656)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember | (5,560,838)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember | (4,577,566)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember
Total assets | $ 17,727,123 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember |  |  |  | $ 22,394,401 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember |  |  |  | $ 17,727,123 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember | $ 22,394,401 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember | $ 14,906,904 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = qcrh_AllOtherMember

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