Accounting Policies, by Policy (Policies)	6 Months Ended
Jun. 30, 2014
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	The consolidated financial statements of ConnectOne Bancorp, Inc. (the “Parent Corporation”) are prepared on an accrual basis and include the accounts of the Parent Corporation and its wholly-owned subsidiary, ConnectOne Bank (the “Bank” and, collectively with the Parent Corporation and the Parent Corporation’s other direct and indirect subsidiaries, the “Corporation”). All significant intercompany accounts and transactions have been eliminated from the accompanying consolidated financial statements.
Use of Estimates, Policy [Policy Text Block]	In preparing the consolidated financial statements, management has made estimates and assumptions that affect the reported amounts of assets and liabilities as of the dates of the consolidated statements of condition and that affect the results of operations for the periods presented. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to change in the near term relate to the determination of the allowance for loan losses, the other-than-temporary impairment evaluation of securities, the evaluation of the impairment of goodwill and the evaluation of deferred tax assets.
Basis of Accounting, Policy [Policy Text Block]	The consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“U.S. GAAP”).
New Accounting Pronouncements, Policy [Policy Text Block]	FASB ASU 2014-04: Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure. EITF Issue 13-E sought to define “in substance repossession or foreclosure” because of the diversity in practice regarding when entities were reclassifying loans receivable to other real estate owned instead of as a loan receivable. The timing of loan reclassifications to OREO may be qualitatively significant to regulators and other financial statement users. “In substance repossession or foreclosure” is clarified by the ASU. A creditor is considered to have received physical possession (resulting from an in substance repossession) of residential real estate property collateralizing a consumer mortgage loan only upon the occurrence of either of the following: a) The creditor obtains legal title to the residential real estate property upon completion of a foreclosure. A creditor may obtain legal title to the residential real estate property even if the borrower has redemption rights that provide the borrower with a legal right for a period of time after a foreclosure to reclaim the real estate property by paying certain amounts specified by law. b) The borrower conveys all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. The deed in lieu of foreclosure or similar legal agreement is completed when agreed-upon terms and conditions have been satisfied by both the borrower and the creditor. The ASU is effective for fiscal years beginning after December 15, 2014, and interim periods therein. Early adoption is permitted. The Corporation will adopt the methodologies prescribed by this ASU by the date required, and does not anticipate that the ASU will have a material effect on its financial position or results of operations. FASB ASU No. 2014-09: Revenue from Contracts with Customers. In May 2014, the FASB issued an update creating FASB Topic 606, Revenue from Contracts with Customers. The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The core principle of the guidance 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. The guidance provides steps to follow to achieve the core principle. An entity should disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Qualitative and quantitative information is required about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2016. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements. FASB ASC ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. In June 2014, the FASB issued an update impacting FASB ASC 860, Transfers and Servicing. The amendments in this update change the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. The amendments also require new disclosures. An entity is required to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements. An entity must also provide additional information about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The amendments in this update become effective for the first interim or annual period beginning after December 15, 2014. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements, but it is not expected to have a material impact. FASB ASC ASU No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. In June 2014, the FASB issued an update impacting FASB ASC 860, Transfers and Servicing. Generally, an award with a performance target also requires an employee to render service until the performance target is achieved. In some cases, however, the terms of an award may provide that the performance target could be achieved after an employee completes the requisite service period. The amendments in this update require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. An entity should apply guidance in Topic 718 as it relates to awards with performance conditions that affect vesting to account for such awards. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period for which the service has already been rendered. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements, but it is not expected to have a material impact.
Fair Value of Financial Instruments, Policy [Policy Text Block]	*Fair Value of Financial Instruments* FASB ASC 825-10 requires all entities to disclose the estimated fair value of their financial instrument assets and liabilities. For the Corporation, as for most financial institutions, the majority of its assets and liabilities are considered financial instruments as defined in FASB ASC 825-10. Many of the Corporation’s financial instruments, however, lack an available trading market as characterized by a willing buyer and willing seller engaging in an exchange transaction. It is also the Corporation’s general practice and intent to hold its financial instruments to maturity and not to engage in trading or sales activities except for loans held-for-sale and investment securities available-for-sale. Therefore, significant estimations and assumptions, as well as present value calculations, were used by the Corporation for the purposes of this disclosure.

Accounting Policies, by Policy (Policies)

6 Months Ended

Jun. 30, 2014

Consolidation, Policy [Policy Text Block]

The consolidated financial statements of ConnectOne Bancorp, Inc. (the “Parent Corporation”) are prepared on an accrual basis and include the accounts of the Parent Corporation and its wholly-owned subsidiary, ConnectOne Bank (the “Bank” and, collectively with the Parent Corporation and the Parent Corporation’s other direct and indirect subsidiaries, the “Corporation”). All significant intercompany accounts and transactions have been eliminated from the accompanying consolidated financial statements.

Use of Estimates, Policy [Policy Text Block]

In preparing the consolidated financial statements, management has made estimates and assumptions that affect the reported amounts of assets and liabilities as of the dates of the consolidated statements of condition and that affect the results of operations for the periods presented. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to change in the near term relate to the determination of the allowance for loan losses, the other-than-temporary impairment evaluation of securities, the evaluation of the impairment of goodwill and the evaluation of deferred tax assets.

Basis of Accounting, Policy [Policy Text Block]

The consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“U.S. GAAP”).

New Accounting Pronouncements, Policy [Policy Text Block]

FASB ASU 2014-04: Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure. EITF Issue 13-E sought to define “in substance repossession or foreclosure” because of the diversity in practice regarding when entities were reclassifying loans receivable to other real estate owned instead of as a loan receivable. The timing of loan reclassifications to OREO may be qualitatively significant to regulators and other financial statement users. “In substance repossession or foreclosure” is clarified by the ASU. A creditor is considered to have received physical possession (resulting from an in substance repossession) of residential real estate property collateralizing a consumer mortgage loan only upon the occurrence of either of the following: a) The creditor obtains legal title to the residential real estate property upon completion of a foreclosure. A creditor may obtain legal title to the residential real estate property even if the borrower has redemption rights that provide the borrower with a legal right for a period of time after a foreclosure to reclaim the real estate property by paying certain amounts specified by law. b) The borrower conveys all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. The deed in lieu of foreclosure or similar legal agreement is completed when agreed-upon terms and conditions have been satisfied by both the borrower and the creditor. The ASU is effective for fiscal years beginning after December 15, 2014, and interim periods therein. Early adoption is permitted. The Corporation will adopt the methodologies prescribed by this ASU by the date required, and does not anticipate that the ASU will have a material effect on its financial position or results of operations.

FASB ASU No. 2014-09: Revenue from Contracts with Customers. In May 2014, the FASB issued an update creating FASB Topic 606, Revenue from Contracts with Customers. The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The core principle of the guidance 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. The guidance provides steps to follow to achieve the core principle. An entity should disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Qualitative and quantitative information is required about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2016. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements.

FASB ASC ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. In June 2014, the FASB issued an update impacting FASB ASC 860, Transfers and Servicing. The amendments in this update change the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. The amendments also require new disclosures. An entity is required to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements. An entity must also provide additional information about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The amendments in this update become effective for the first interim or annual period beginning after December 15, 2014. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements, but it is not expected to have a material impact.

FASB ASC ASU No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. In June 2014, the FASB issued an update impacting FASB ASC 860, Transfers and Servicing. Generally, an award with a performance target also requires an employee to render service until the performance target is achieved. In some cases, however, the terms of an award may provide that the performance target could be achieved after an employee completes the requisite service period. The amendments in this update require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. An entity should apply guidance in Topic 718 as it relates to awards with performance conditions that affect vesting to account for such awards. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period for which the service has already been rendered. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements, but it is not expected to have a material impact.

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Value of Financial Instruments

FASB ASC 825-10 requires all entities to disclose the estimated fair value of their financial instrument assets and liabilities. For the Corporation, as for most financial institutions, the majority of its assets and liabilities are considered financial instruments as defined in FASB ASC 825-10. Many of the Corporation’s financial instruments, however, lack an available trading market as characterized by a willing buyer and willing seller engaging in an exchange transaction. It is also the Corporation’s general practice and intent to hold its financial instruments to maturity and not to engage in trading or sales activities except for loans held-for-sale and investment securities available-for-sale. Therefore, significant estimations and assumptions, as well as present value calculations, were used by the Corporation for the purposes of this disclosure.

- 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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