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Loans and the Allowance for Loan Losses (Details) - Loans by segment modified as troubled debt restructurings - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Recorded Investment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning balance | $ 20,518 | $ 13,818
Additions | 18,913 | 10,378
Payoffs/paydowns | (7,094) | (3,098)
Transfers |  | (580)
Ending balance | 32,337 | 20,518
ALLL [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning balance |  |
Additions | 11 |
Payoffs/paydowns |  |
Transfers |  |
Ending balance | $ 11 |

X
- Definition Balance of troubled debt allowance for loan and lease losses. + References No definition available. + Details
Name: | cnob_FinancingReceivableTroubledDebtRestructuring
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Additions to the balance of troubled debt allowance for loan and lease losses. + References No definition available. + Details
Name: | cnob_FinancingReceivableTroubledDebtRestructuringAdditions
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Payoffs or paydowns of troubled debt allowance for loan and lease losses. + References No definition available. + Details
Name: | cnob_FinancingReceivableTroubledDebtRestructuringPayoffs
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Transfers into the balance of troubled debt allowance for loan and lease losses. + References No definition available. + Details
Name: | cnob_FinancingReceivableTroubledDebtRestructuringTransfer
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=cnob_RecordedInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_AllowanceForLoanAndLeaseLossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |