Accounting Policies, by Policy (Policies)	9 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	Basis of presentation: The interim unaudited consolidated financial statements contained herein should be read in conjunction with the audited consolidated financial statements and accompanying notes to the consolidated financial statements for the fiscal year ended December 31, 2013, included in QCR Holdings, Inc.’s (the “Company”) Form 10-K filed with the Securities and Exchange Commission on March 10, 2014. Accordingly, footnote disclosures, which would substantially duplicate the disclosures contained in the audited consolidated financial statements, have been omitted. The financial information of the Company included herein has been prepared in accordance with U.S. generally accepted accounting principles for interim financial reporting and has been prepared pursuant to the rules and regulations for reporting on Form 10-Q and Rule 10-01 of Regulation S-X. Such information reflects all adjustments (consisting of normal recurring adjustments) that are, in the opinion of management, necessary for a fair presentation of the financial position and results of operations for the periods presented. Any differences appearing between the numbers presented in financial statements and management’s discussion and analysis are due to rounding. The results of the interim period ended September 30, 2014, are not necessarily indicative of the results expected for the year ending December 31, 2014. The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries which include three commercial banks: Quad City Bank & Trust Company (“QCBT”), Cedar Rapids Bank & Trust Company (“CRBT”), and Rockford Bank & Trust Company (“RB&T”). On May 13, 2013, the Company acquired Community National Bancorporation (“Community National”) and its banking subsidiary Community National Bank (“CNB”). The Company operated CNB as a separate banking charter from the acquisition date until October 26, 2013, when CNB’s charter was merged with and into CRBT. CNB’s merged branch offices operate as a division of CRBT under the name of “Community Bank & Trust”. QCBT, CRBT, and RB&T are all state-chartered commercial banks. The Company also engages in direct financing lease contracts through m2 Lease Funds, LLC (“m2 Lease Funds”), a wholly-owned subsidiary of QCBT. All material intercompany transactions and balances have been eliminated in consolidation.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent accounting developments: In January 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The objective of ASU 2014-04 is to reduce diversity by clarifying when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. ASU 2014-04 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014 and is not expected to have a significant impact on the Company’s consolidated financial statements. In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers. ASU 2014-09 implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract and (v) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 is effective on January 1, 2017 and is not expected to have a significant impact on the Company’s financial statements. In June 2014, FASB issued ASU 2014-11, Transfers and Servicing. ASU 2014-11 requires that repurchase-to-maturity transactions be accounted for as secured borrowings, consistent with the accounting for other repurchase agreements. In addition, ASU 2014-11 requires separate accounting for repurchase financings, which entail the transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty. The standard requires entities to disclose certain information about transfers accounted for as sales in transactions that are economically similar to repurchase agreements. In addition, ASU 2014-11 requires disclosures related to collateral and remaining tenor and of the potential risks associated with repurchase agreements, securities lending transactions and repurchase-to-maturity transactions. ASU 2014-11 is effective on January 1, 2015 and is not expected to have a significant impact on the Company’s consolidated financial statements. In August 2014, FASB issued ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans Upon Foreclosure. ASU 2014-14 requires creditors to reclassify loans that are within the scope of the ASU to “other receivables” upon foreclosure, rather than reclassifying them as other real estate owned. The most common types of government guaranteed loans include those guaranteed by the Federal Housing Authority (FHA), U.S. Department of Housing and Urban Development (HUD), U.S. Department of Veterans Affairs (VA) and the U.S. Small Business Administration (SBA). The separate other receivable recorded upon foreclosure is to be measured based on the amount of the loan balance (principal and interest) the creditor expects to recover from the guarantor. ASU 2014-14 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014 and is not expected to have a significant impact on the Company’s consolidated financial statements.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	Allowance for estimated losses on loans/leases: The Company has certain loans risk-rated 7 (substandard), which are not classified as impaired based on the facts of the credit. For these non-impaired and risk-rated 7 loans, the Company does not provide a general allowance as it does for all other non-impaired loans. Rather, the Company performs a more precise analysis including evaluation of the cash flow and collateral valuation for each individual credit. A specific allowance is established based upon this evaluation. These non-impaired risk-rated 7 loans exist primarily in the commercial and industrial and commercial real estate segments.
Reclassification, Policy [Policy Text Block]	Reclassifications: Certain amounts in the prior year consolidated financial statements have been reclassified, with no effect on net income or stockholders’ equity, to conform with the current period presentation.

Accounting Policies, by Policy (Policies)

9 Months Ended

Sep. 30, 2014

Consolidation, Policy [Policy Text Block]

Basis of presentation: The interim unaudited consolidated financial statements contained herein should be read in conjunction with the audited consolidated financial statements and accompanying notes to the consolidated financial statements for the fiscal year ended December 31, 2013, included in QCR Holdings, Inc.’s (the “Company”) Form 10-K filed with the Securities and Exchange Commission on March 10, 2014. Accordingly, footnote disclosures, which would substantially duplicate the disclosures contained in the audited consolidated financial statements, have been omitted.

The financial information of the Company included herein has been prepared in accordance with U.S. generally accepted accounting principles for interim financial reporting and has been prepared pursuant to the rules and regulations for reporting on Form 10-Q and Rule 10-01 of Regulation S-X. Such information reflects all adjustments (consisting of normal recurring adjustments) that are, in the opinion of management, necessary for a fair presentation of the financial position and results of operations for the periods presented. Any differences appearing between the numbers presented in financial statements and management’s discussion and analysis are due to rounding. The results of the interim period ended September 30, 2014, are not necessarily indicative of the results expected for the year ending December 31, 2014.

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries which include three commercial banks: Quad City Bank & Trust Company (“QCBT”), Cedar Rapids Bank & Trust Company (“CRBT”), and Rockford Bank & Trust Company (“RB&T”). On May 13, 2013, the Company acquired Community National Bancorporation (“Community National”) and its banking subsidiary Community National Bank (“CNB”). The Company operated CNB as a separate banking charter from the acquisition date until October 26, 2013, when CNB’s charter was merged with and into CRBT. CNB’s merged branch offices operate as a division of CRBT under the name of “Community Bank & Trust”. QCBT, CRBT, and RB&T are all state-chartered commercial banks. The Company also engages in direct financing lease contracts through m2 Lease Funds, LLC (“m2 Lease Funds”), a wholly-owned subsidiary of QCBT. All material intercompany transactions and balances have been eliminated in consolidation.

New Accounting Pronouncements, Policy [Policy Text Block]

Recent accounting developments: In January 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The objective of ASU 2014-04 is to reduce diversity by clarifying when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. ASU 2014-04 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014 and is not expected to have a significant impact on the Company’s consolidated financial statements.

In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers. ASU 2014-09 implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract and (v) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 is effective on January 1, 2017 and is not expected to have a significant impact on the Company’s financial statements.

In June 2014, FASB issued ASU 2014-11, Transfers and Servicing. ASU 2014-11 requires that repurchase-to-maturity transactions be accounted for as secured borrowings, consistent with the accounting for other repurchase agreements. In addition, ASU 2014-11 requires separate accounting for repurchase financings, which entail the transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty. The standard requires entities to disclose certain information about transfers accounted for as sales in transactions that are economically similar to repurchase agreements. In addition, ASU 2014-11 requires disclosures related to collateral and remaining tenor and of the potential risks associated with repurchase agreements, securities lending transactions and repurchase-to-maturity transactions. ASU 2014-11 is effective on January 1, 2015 and is not expected to have a significant impact on the Company’s consolidated financial statements.

In August 2014, FASB issued ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans Upon Foreclosure. ASU 2014-14 requires creditors to reclassify loans that are within the scope of the ASU to “other receivables” upon foreclosure, rather than reclassifying them as other real estate owned. The most common types of government guaranteed loans include those guaranteed by the Federal Housing Authority (FHA), U.S. Department of Housing and Urban Development (HUD), U.S. Department of Veterans Affairs (VA) and the U.S. Small Business Administration (SBA). The separate other receivable recorded upon foreclosure is to be measured based on the amount of the loan balance (principal and interest) the creditor expects to recover from the guarantor. ASU 2014-14 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014 and is not expected to have a significant impact on the Company’s consolidated financial statements.

Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]

Allowance for estimated losses on loans/leases: The Company has certain loans risk-rated 7 (substandard), which are not classified as impaired based on the facts of the credit. For these non-impaired and risk-rated 7 loans, the Company does not provide a general allowance as it does for all other non-impaired loans. Rather, the Company performs a more precise analysis including evaluation of the cash flow and collateral valuation for each individual credit. A specific allowance is established based upon this evaluation. These non-impaired risk-rated 7 loans exist primarily in the commercial and industrial and commercial real estate segments.

Reclassification, Policy [Policy Text Block]

Reclassifications: Certain amounts in the prior year consolidated financial statements have been reclassified, with no effect on net income or stockholders’ equity, to conform with the current period presentation.

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

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