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Loans and the Allowance for Credit Losses (Details) - Schedule of Composition of Loans by Loan Segments $ in Thousands | Sep. 30, 2021 USD ($) Loans | Dec. 31, 2020 USD ($) Loans
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Number of loans | Loans | 10 | 113
Unpaid Principal Balance | $ | $ 10,297 | $ 207,000
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Number of loans | Loans | 4 |
Unpaid Principal Balance | $ | $ 309 |
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Number of loans | Loans | 6 |
Unpaid Principal Balance | $ | $ 9,988 |

X
- Definition Amount of deferred loan. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of deferred loans. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |