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Loans and the Allowance for Loan and Lease Losses (Details) - Schedule of accretable yield, or income expected to be collected - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Schedule of accretable yield, or income expected to be collected [Abstract] |  |
Beginning balance | $ 4,805 | $ 5,013
Accretion of income | $ (1,206) | (142)
Disposals |  | (66)
Ending balance | $ 3,599 | $ 4,805

X
- Definition Disposals. + References No definition available. + Details
Name: | cnob_DisposalOfLoansAndAllowances
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loans and leases receivable purchased loans. + References No definition available. + Details
Name: | cnob_LoansAndLeasesReceivablePurchasedLoans
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans and leases receivable purchased loans accretion of income. + References No definition available. + Details
Name: | cnob_LoansAndLeasesReceivablePurchasedLoansAccretionOfIncome
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | cnob_ScheduleOfAccretableYieldOrIncomeExpectedToBeCollectedAbstract
Namespace Prefix: | cnob_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration