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PREMISES AND EQUIPMENT (Details) - Schedule of Capital Lease in Premises and Equipment (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Schedule of Capital Lease in Premises and Equipment [Abstract] |
Capital Lease | $ 3,422 cnob_CapitalLeaseInPremisesAndEquipment
Less: accumulated amortization | 1,026 cnob_CapitalLeaseInPremisesAndEquipmentExcludingAccumulatedAmortization
| $ 2,396 cnob_CapitalLeaseInPremisesAndEquipmentNet

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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 Capital lease in premises and equipment, net. + 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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- Details
Name: | cnob_ScheduleOfCapitalLeaseInPremisesAndEquipmentAbstract
Namespace Prefix: | cnob_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration