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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, 2016 | Dec. 31, 2015
Schedule of accretable yield, or income expected to be collected [Abstract] |  |
Beginning balance | $ 3,599 | $ 4,805
New loans purchased |  |
Accretion of income | (739) | (1,206)
Reclassifications from nonaccretable difference |  |
Disposals |  |
Ending balance | $ 2,860 | $ 3,599

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

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- 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

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- 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
- Definition New loans purchased. + References No definition available. + Details
Name: | cnob_NewLoansPurchased
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reclassifications from nonaccretable difference. + References No definition available. + Details
Name: | cnob_ReclassificationsFromNonaccretableDifference
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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