Nature of Operations and Principles of Consolidation	9 Months Ended
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Principles of Consolidation	Note 1. Nature of Operations and Principles of Consolidation 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 “Company”). All significant intercompany accounts and transactions have been eliminated from the accompanying consolidated financial statements. The Bank is a community-based, full-service New Jersey-chartered commercial bank that was founded in 2005. The Bank operates from its headquarters located at 301 Sylvan Avenue in the Borough of Englewood Cliffs, Bergen County, New Jersey and through its twenty other banking offices. Substantially all loans are secured by specific items of collateral including business assets, consumer assets, and commercial and residential real estate or are expected to be paid from cash flow of business operations. Commercial loans are expected to be repaid from cash flow from business operations. There are no significant concentrations of loans to any one industry or client. However, the clients’ ability to repay their loans is dependent on the cash flows, real estate and general economic conditions in the area. The preceding unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X, and, accordingly, do not include all of the information and footnotes required by GAAP for complete financial statements. However, in the opinion of management, all adjustments (consisting only of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended September 30, 2016 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2016, or for any other interim period. The Company’s 2015 Annual Report on Form 10-K should be read in conjunction with these consolidated financial statements. 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. The consolidated financial statements have been prepared in conformity with GAAP. Some items in the prior year consolidated financial statements were reclassified to conform to current presentation. Reclassifications had no effect on prior year net income or stockholders’ equity.

Nature of Operations and Principles of Consolidation

9 Months Ended

Sep. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Operations and Principles of Consolidation

Note 1. Nature of Operations and Principles of Consolidation

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 “Company”). All significant intercompany accounts and transactions have been eliminated from the accompanying consolidated financial statements.

The Bank is a community-based, full-service New Jersey-chartered commercial bank that was founded in 2005. The Bank operates from its headquarters located at 301 Sylvan Avenue in the Borough of Englewood Cliffs, Bergen County, New Jersey and through its twenty other banking offices. Substantially all loans are secured by specific items of collateral including business assets, consumer assets, and commercial and residential real estate or are expected to be paid from cash flow of business operations. Commercial loans are expected to be repaid from cash flow from business operations. There are no significant concentrations of loans to any one industry or client. However, the clients’ ability to repay their loans is dependent on the cash flows, real estate and general economic conditions in the area.

The preceding unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X, and, accordingly, do not include all of the information and footnotes required by GAAP for complete financial statements. However, in the opinion of management, all adjustments (consisting only of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended September 30, 2016 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2016, or for any other interim period. The Company’s 2015 Annual Report on Form 10-K should be read in conjunction with these consolidated financial statements.

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.

The consolidated financial statements have been prepared in conformity with GAAP. Some items in the prior year consolidated financial statements were reclassified to conform to current presentation. Reclassifications had no effect on prior year net income or stockholders’ equity.