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v3.20.4

Income Taxes (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Temporary surtax on allocated income | $ 1
January 1, 2018 through December 31, 2019 [Member] |
Percentage of surtax | 2.50%
January 1, 2020 through December 31, 2021 [Member] |
Percentage of surtax | 1.50%

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- Definition Percentage of surtax. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Temporary surtax on allocated income. + References No definition available. + Details
Name: | cnob_TemporarySurtaxOnAllocatedIncome
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_TaxPeriodAxis=cnob_OneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=cnob_TwoYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |