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Pension and Other Benefits (Details) - Schedule of Retrospective Application to Consolidated Statement of Condition - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
As previously reported [Member] |  |
Other components of net periodic pension expense |  |
Salaries and employee benefits | 35,128 | 31,030
As reported under the new guidance [Member] |  |
Other components of net periodic pension expense | 250 | 304
Salaries and employee benefits | $ 34,878 | $ 30,726

X
- Definition Amount of expense for employee benefit and salaries. + References No definition available. + Details
Name: | cnob_SalariesAndEmployeeBenefits
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period expense related to postemployment benefits. + References No definition available. + Details
Name: | us-gaap_PostemploymentBenefitsPeriodExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_RestatementAxis=srt_ScenarioPreviouslyReportedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=cnob_AsReportedUnderNewGuidanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |