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INVESTMENT SECURITIES (Details) - Schedule of OTTI charges (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Schedule of OTTI charges [Abstract] |  |
One variable rate private label CMO |  | $ 484 cnob_OneVariablePrivateRateLabelCmo
Pooled trust preferred securities | 628 cnob_TwoPooledTrustPreferredSecurities | 68 cnob_TwoPooledTrustPreferredSecurities
Principal losses on a variable rate CMO | 24 cnob_PrincipalLossesOnAVariableRateCMO | 318 cnob_PrincipalLossesOnAVariableRateCMO
Total other-than-temporary impairment charges | $ 652 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ 870 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet

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- Definition One variable private rate label CMO + References No definition available. + Details
Name: | cnob_OneVariablePrivateRateLabelCmo
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Principal losses on variable rate CMO. + References No definition available. + Details
Name: | cnob_PrincipalLossesOnAVariableRateCMO
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Two Pooled Trust Preferred Securities + References No definition available. + Details
Name: | cnob_TwoPooledTrustPreferredSecurities
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563 + Details
Name: | us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration