XML 91 R79.htm IDEA: XBRL DOCUMENT
v3.25.2

Note 10 - Components of Net Periodic Pension Cost (Details Textual) - Pension Plan [Member] $ in Millions | Jun. 01, 2025 USD ($) | Jun. 30, 2025
--- | --- | ---
Fixed Income Funds [Member] | Maximum [Member] | Standard & Poor's, BBB Rating [Member] |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage |  | 5.00%
Fixed Income Funds [Member] | Moody's, Baa1 Rating [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage |  | 5.00%
Single Investment Security, Excluding Fixed Income Investments [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage |  | 5.00%
Mutual Fund [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage |  | 10.00%
First of Long Island Corporation [Member] |  |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | $ 11.2 |
Defined Benefit Plan, Minimum Age of Employee | 21 |
Defined Benefit Plan, Minimum Service (Month) | 12 months |
Defined Benefit Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 2.00% |
Defined Benefit Plan, Employers Matching Contribution, Vesting Period (Year) | 4 years |

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined benefit plan. + References No definition available. + Details
Name: | cnob_DefinedBenefitPlanEmployerMatchingContributionPercentOfEmployeesGrossPay
Namespace Prefix: | cnob_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of vesting for employer's matching contributions to a defined benefit plan. + References No definition available. + Details
Name: | cnob_DefinedBenefitPlanEmployersMatchingContributionVestingPeriod
Namespace Prefix: | cnob_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum age of employee to participate in the defined benefit plan. + References No definition available. + Details
Name: | cnob_DefinedBenefitPlanMinimumAgeOfEmployee
Namespace Prefix: | cnob_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum service period of employee to participate in defined benefit plan. + References No definition available. + Details
Name: | cnob_DefinedBenefitPlanMinimumService
Namespace Prefix: | cnob_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanFundedStatusOfPlan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of investment to total investment within defined benefit plan asset category. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsBBBRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingMoodysAxis=srt_MoodysBaa1RatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=cnob_SingleInvestmentSecurityExcludingFixedIncomeInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_MutualFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=cnob_FirstOfLongIslandCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |