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Premises and Equipment (Details) - Schedule of Capital Lease in Premises and Equipment - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Property, Plant and Equipment [Abstract] |  |
Capital Lease | $ 3,408 | $ 3,408
Less: accumulated amortization | 1,696 | 1,526
Lease in premises and equipment | $ 1,712 | $ 1,882

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

X
- Definition Capital lease in premises and equipment excluding accumulated amortization. + 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 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: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration