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LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) - Schedule of accretable yield, or income expected to be collected (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Schedule of accretable yield, or income expected to be collected [Abstract] |  |
Balance at July 1, 2014 | $ 5,013 cnob_LoansAndLeasesReceivablePurchasedLoans |
Accretion of income | (142)cnob_LoansAndLeasesReceivablePurchasedLoansAccretionOfIncome |
Disposals | (66)us-gaap_GainLossOnSaleOfPropertyPlantEquipment | 2 us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Balance at December 31, 2014 | $ 4,805 cnob_LoansAndLeasesReceivablePurchasedLoans |

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- Definition Loans and leases receivable purchased loans. + References No definition available. + Details
Name: | cnob_LoansAndLeasesReceivablePurchasedLoans
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Loans and leases receivable purchased loans accretion of income. + References No definition available. + Details
Name: | cnob_LoansAndLeasesReceivablePurchasedLoansAccretionOfIncome
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | cnob_ScheduleOfAccretableYieldOrIncomeExpectedToBeCollectedAbstract
Namespace Prefix: | cnob_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration