Accounting Policies, by Policy (Policies)	3 Months Ended
Mar. 31, 2015
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, 2014, included in QCR Holdings, Inc.’s (the “Company”) Form 10-K filed with the Securities and Exchange Commission on March 12, 2015. 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 March 31, 2015, are not necessarily indicative of the results expected for the year ending December 31, 2015. 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”). 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 was effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. Adoption did not have an 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 it 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 was effective on January 1, 2015 and adoption did not have an 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. Adoption did not have an impact on the Company’s consolidated financial statements. In February 2015, FASB issued ASU 2015-02, Consolidation: Amendments to the Consolidation Analysis. ASU 2015-02 is intended to improve targeted areas of consolidation guidance for legal entities such as limited partnerships, limited liability corporations, and securitization structures (collateralized debt obligations, collateralized loan obligations, and mortgage-backed security transactions). The ASU focuses on the consolidation evaluation for reporting organizations that are required to evaluate whether they should consolidate certain legal entities. The ASU also reduces the number of consolidation models from four to two. ASU 2015-02 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2015 and adoption is not expected to have a significant impact on the Company’s consolidated financial statements.
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)

3 Months Ended

Mar. 31, 2015

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, 2014, included in QCR Holdings, Inc.’s (the “Company”) Form 10-K filed with the Securities and Exchange Commission on March 12, 2015. 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 March 31, 2015, are not necessarily indicative of the results expected for the year ending December 31, 2015.

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”). 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 was effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. Adoption did not have an 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 it 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 was effective on January 1, 2015 and adoption did not have an 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. Adoption did not have an impact on the Company’s consolidated financial statements.

In February 2015, FASB issued ASU 2015-02, Consolidation: Amendments to the Consolidation Analysis. ASU 2015-02 is intended to improve targeted areas of consolidation guidance for legal entities such as limited partnerships, limited liability corporations, and securitization structures (collateralized debt obligations, collateralized loan obligations, and mortgage-backed security transactions). The ASU focuses on the consolidation evaluation for reporting organizations that are required to evaluate whether they should consolidate certain legal entities. The ASU also reduces the number of consolidation models from four to two. ASU 2015-02 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2015 and adoption is not expected to have a significant impact on the Company’s consolidated financial statements.

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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