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Premises and Equipment (Details) - Schedule of Capital Lease in Premises and Equipment - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Capital Lease in Premises and Equipment [Abstract] |  |
Capital Lease | $ 3,408 | $ 3,422
Less: accumulated amortization | 1,526 | 1,369
Lease in premises and equipment | $ 1,882 | $ 2,053

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- Definition Capital lease in premises and equipment. + References No definition available. + Details
Name: | cnob_CapitalLeaseInPremisesAndEquipment
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Capital lease in premises and equipment excluding accumulated amortization. + References No definition available. + Details
Name: | cnob_CapitalLeaseInPremisesAndEquipmentExcludingAccumulatedAmortization
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Cutstom Element. + References No definition available. + Details
Name: | cnob_CapitalLeaseInPremisesAndEquipmentNet
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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