Nature of Operations, Principles of Consolidation and Risk and Uncertainties (Policies)	6 Months Ended
Jun. 30, 2020
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations ConnectOne Bancorp, Inc. (the “Parent Corporation”) is incorporated under the laws of the State of New Jersey and is a registered bank holding company. The Parent Corporation’s business currently consists of the operation of its wholly-owned subsidiary, ConnectOne Bank (the “Bank” and, collectively with the Parent Corporation and the Parent Corporation’s subsidiaries, the “Company”). The Bank’s subsidiaries include Union Investment Co. (a New Jersey investment company), Twin Bridge Investment Co. (a Delaware investment company), ConnectOne Preferred Funding Corp. (a New Jersey real estate investment trust), Center Financial Group, LLC (a New Jersey financial services company), Center Advertising, Inc. (a New Jersey advertising company), Morris Property Company, LLC, (a New Jersey limited liability company), Volosin Holdings, LLC, (a New Jersey limited liability company), NJCB Spec-1, LLC (a New Jersey limited liability company) and BoeFly, Inc. (a New Jersey online business lending marketplace). 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 thirty other banking offices. Substantially all loans are secured with various types of collateral, including business assets, consumer assets and commercial/residential real estate. Each borrower’s ability to repay its loans is dependent on the conversion of assets, cash flows generated from the borrowers’ business, real estate rental and consumer wages. 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 and six months ended June 30, 2020 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2020, or for any other interim period. The Company’s 2019 Annual Report on Form 10-K should be read in conjunction with these consolidated financial statements.
Principals of Consolidation	Principals of Consolidation 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.
Use of Estimates	Use of Estimates 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.
Risks and Uncertainties	Risks and Uncertainties As previously disclosed, on March 11, 2020, the World Health Organization declared the outbreak of COVID-19 as a global pandemic, which continues to spread throughout the United States and around the world. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) was enacted to, among other things, provide emergency assistance for individuals, families and businesses affected by the COVID-19 pandemic. The COVID-19 pandemic has adversely affected, and continues to adversely affect economic activity globally, nationally and locally. Actions taken around the world to help mitigate the spread of COVID-19 include restrictions on travel, quarantines in certain areas, and forced closures for certain types of public places and businesses. COVID-19 and actions taken to mitigate the spread of it have had and are expected to continue to have an adverse impact on the economies and financial markets of many countries, including the New Jersey/New York metropolitan area in which the Company primarily operates. Although the Company has been able to continue operations while taking steps to ensure the safety of employees and customers, COVID-19 could also potentially create widespread business continuity issues for the Company. Federal Reserve reductions in interest rates and other effects of the COVID-19 pandemic may adversely affect the Company's financial condition and results of operations in future periods. It is unknown how long the adverse conditions associated with the COVID-19 pandemic will last and what the complete financial effect will be to the Company. It is reasonably possible that estimates made in the financial statements could be materially and adversely impacted in the near term as a result of these conditions, including the determination of the allowance for loan losses, fair value of financial instruments, impairment of goodwill and other intangible assets and income taxes.
Adoption of New Accounting Standards in 2020	Adoption of New Accounting Standards in 2020 ASU No. 2017-04, “Intangibles – Goodwill and Other (Topic 350).” ASU 2017-04 aims to simplify the subsequent measurement of goodwill. Under these amendments, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The Board also eliminated the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment. An entity is required to disclose the amount of goodwill allocated to each reporting unit with a zero or negative carrying amount of net assets and still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. ASU 2017-04 was effective for the Company on January 1, 2020 and did not have a material impact on the Company’s financial statement disclosures. ASU No. 2017-08, “Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities.” ASU No. 2017-08 shortens the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. ASU 2017-08 was effective for the Company on January 1, 2020 and did not have a material impact on the Company’s financial statement disclosures. ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement.” The amendments in this update modify disclosure requirements on fair value measurements by removing, modifying and adding certain disclosure requirements. The amendments primarily pertain to Level 3 fair value measurements and depending on the amendment are applied either prospectively or retrospectively. ASU 2018-03 was effective for the Company on January 1, 2020 and did not have a material impact on the Company’s financial statement disclosures. ASU 2018-15, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” These amendments align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by these amendments. ASU 2018-15 was effective for the Company on January 1, 2020 and did not have a material impact on the Company’s financial statement disclosures.
Newly Issued, But Not Yet Effective Accounting Standards	Newly Issued, But Not Yet Effective Accounting Standards In June 2016, the FASB issued guidance related to credit losses on financial instruments. This update, commonly referred to as the current expected credit losses methodology (“CECL”), will change the accounting for credit losses on loans and debt securities. Under the new guidance, the Company’s measurement of expected credit losses is to be based on information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. For loans, this measurement will take place at the time the financial asset is first added to the balance sheet and periodically thereafter. This differs significantly from the “incurred loss” model previously required, but still permitted, under GAAP, which delays recognition until it is probable a loss has been incurred. ASU 2016-13 was effective, subject to optional delay discussed below, for the Company on January 1, 2020. In accordance with the accounting relief provisions of the CARES Act, as it currently stands, the Company elected to delay the adoption of FASB’s new standard covering the CECL model until the earlier of the termination date of the national emergency declared by President Trump on March 13, 2020 under the National Emergencies Act, related to the outbreak of COVID-19, and December 31, 2020. Management reached this decision due to the complexities of CECL loan loss forecasting exacerbated by the quickly changing economic environment resulting from the COVID-19 pandemic. Once the delay provision has been terminated, adoption will be retroactive to January 1, 2020. During 2019, the Company implemented the CECL methodology and ran it concurrently with the historical incurred method. While the Company has not finalized the impact of implementing CECL, the Company expects to recognize a one-time cumulative effect adjustment to the allowance and beginning retained earnings, net of tax, upon adoption. The future impact of CECL on the Company’s allowance for credit losses and provision expense subsequent to the initial adoption will depend on changes in the loan portfolio, economic conditions and refinements to key assumptions including forecasting and qualitative factors. The Company measured its allowance under its current incurred loan loss model as of June 30, 2020.

Nature of Operations, Principles of Consolidation and Risk and Uncertainties (Policies)

6 Months Ended

Jun. 30, 2020

ConnectOne Bancorp, Inc. (the “Parent Corporation”) is incorporated under the laws of the State of New Jersey and is a registered bank holding company. The Parent Corporation’s business currently consists of the operation of its wholly-owned subsidiary, ConnectOne Bank (the “Bank” and, collectively with the Parent Corporation and the Parent Corporation’s subsidiaries, the “Company”). The Bank’s subsidiaries include Union Investment Co. (a New Jersey investment company), Twin Bridge Investment Co. (a Delaware investment company), ConnectOne Preferred Funding Corp. (a New Jersey real estate investment trust), Center Financial Group, LLC (a New Jersey financial services company), Center Advertising, Inc. (a New Jersey advertising company), Morris Property Company, LLC, (a New Jersey limited liability company), Volosin Holdings, LLC, (a New Jersey limited liability company), NJCB Spec-1, LLC (a New Jersey limited liability company) and BoeFly, Inc. (a New Jersey online business lending marketplace).

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 thirty other banking offices. Substantially all loans are secured with various types of collateral, including business assets, consumer assets and commercial/residential real estate. Each borrower’s ability to repay its loans is dependent on the conversion of assets, cash flows generated from the borrowers’ business, real estate rental and consumer wages.

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 and six months ended June 30, 2020 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2020, or for any other interim period. The Company’s 2019 Annual Report on Form 10-K should be read in conjunction with these consolidated financial statements.

Principals of Consolidation

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.

Use of Estimates

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.

Risks and Uncertainties

As previously disclosed, on March 11, 2020, the World Health Organization declared the outbreak of COVID-19 as a global pandemic, which continues to spread throughout the United States and around the world. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) was enacted to, among other things, provide emergency assistance for individuals, families and businesses affected by the COVID-19 pandemic. The COVID-19 pandemic has adversely affected, and continues to adversely affect economic activity globally, nationally and locally. Actions taken around the world to help mitigate the spread of COVID-19 include restrictions on travel, quarantines in certain areas, and forced closures for certain types of public places and businesses. COVID-19 and actions taken to mitigate the spread of it have had and are expected to continue to have an adverse impact on the economies and financial markets of many countries, including the New Jersey/New York metropolitan area in which the Company primarily operates. Although the Company has been able to continue operations while taking steps to ensure the safety of employees and customers, COVID-19 could also potentially create widespread business continuity issues for the Company.

Federal Reserve reductions in interest rates and other effects of the COVID-19 pandemic may adversely affect the Company's financial condition and results of operations in future periods. It is unknown how long the adverse conditions associated with the COVID-19 pandemic will last and what the complete financial effect will be to the Company. It is reasonably possible that estimates made in the financial statements could be materially and adversely impacted in the near term as a result of these conditions, including the determination of the allowance for loan losses, fair value of financial instruments, impairment of goodwill and other intangible assets and income taxes.

Adoption of New Accounting Standards in 2020

ASU No. 2017-04, “Intangibles – Goodwill and Other (Topic 350).” ASU 2017-04 aims to simplify the subsequent measurement of goodwill. Under these amendments, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The Board also eliminated the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment. An entity is required to disclose the amount of goodwill allocated to each reporting unit with a zero or negative carrying amount of net assets and still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. ASU 2017-04 was effective for the Company on January 1, 2020 and did not have a material impact on the Company’s financial statement disclosures.

ASU No. 2017-08, “Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities.” ASU No. 2017-08 shortens the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. ASU 2017-08 was effective for the Company on January 1, 2020 and did not have a material impact on the Company’s financial statement disclosures.

ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement.” The amendments in this update modify disclosure requirements on fair value measurements by removing, modifying and adding certain disclosure requirements. The amendments primarily pertain to Level 3 fair value measurements and depending on the amendment are applied either prospectively or retrospectively. ASU 2018-03 was effective for the Company on January 1, 2020 and did not have a material impact on the Company’s financial statement disclosures.

ASU 2018-15, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” These amendments align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by these amendments. ASU 2018-15 was effective for the Company on January 1, 2020 and did not have a material impact on the Company’s financial statement disclosures.

Newly Issued, But Not Yet Effective Accounting Standards

In June 2016, the FASB issued guidance related to credit losses on financial instruments. This update, commonly referred to as the current expected credit losses methodology (“CECL”), will change the accounting for credit losses on loans and debt securities. Under the new guidance, the Company’s measurement of expected credit losses is to be based on information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. For loans, this measurement will take place at the time the financial asset is first added to the balance sheet and periodically thereafter. This differs significantly from the “incurred loss” model previously required, but still permitted, under GAAP, which delays recognition until it is probable a loss has been incurred. ASU 2016-13 was effective, subject to optional delay discussed below, for the Company on January 1, 2020.

In accordance with the accounting relief provisions of the CARES Act, as it currently stands, the Company elected to delay the adoption of FASB’s new standard covering the CECL model until the earlier of the termination date of the national emergency declared by President Trump on March 13, 2020 under the National Emergencies Act, related to the outbreak of COVID-19, and December 31, 2020. Management reached this decision due to the complexities of CECL loan loss forecasting exacerbated by the quickly changing economic environment resulting from the COVID-19 pandemic. Once the delay provision has been terminated, adoption will be retroactive to January 1, 2020. During 2019, the Company implemented the CECL methodology and ran it concurrently with the historical incurred method. While the Company has not finalized the impact of implementing CECL, the Company expects to recognize a one-time cumulative effect adjustment to the allowance and beginning retained earnings, net of tax, upon adoption. The future impact of CECL on the Company’s allowance for credit losses and provision expense subsequent to the initial adoption will depend on changes in the loan portfolio, economic conditions and refinements to key assumptions including forecasting and qualitative factors. The Company measured its allowance under its current incurred loan loss model as of June 30, 2020.