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Subsequent Event (Details) - Subsequent Event [Member] $ in Millions | Nov. 02, 2017 USD ($)
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Subsequent Event [Line Items] |
Value of loans held-for-sale, subsequently returned to loans held-for-investment portfolio | $ 47.4
Valuation allowance of loans held-for-sale, subsequently returned to loans held-for-investment portfolio | 15.3
Estimated pretax charge for transfer of loans returned to held-for-investment portfolio | $ 0.5

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- Definition Estimated pretax charge for transfer of loans returned to held-for-investment portfolio. + References No definition available. + Details
Name: | cnob_EstimatedPretaxChargeForTransferOfLoansReturnedToHeldForInvestmentPortfolio
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Value of loans held-for-sale, subsequently returned to loans held-for-investment portfolio. + References No definition available. + Details
Name: | cnob_ValueOfLoansHeldForSaleReturnedToLoansHeldForInvestmentPortfolio
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Valuation allowance of loans held-for-sale, subsequently returned to loans held-for-investment portfolio. + References No definition available. + Details
Name: | cnob_ValueOfLoansHeldForSaleReturnedToLoansHeldForInvestmentPortfolioValuationAllowance
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |