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INVESTMENT SECURITIES (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract] |  |
Reclassification Of Available For Sale Investment Securities To Held To Maturity At Fair Value |  | $ 138,300,000 cnob_ReclassificationOfAvailableForSaleInvestmentSecuritiesToHeldToMaturityAtFairValue
Other Asset Impairment Charges | $ 0 us-gaap_OtherAssetImpairmentCharges | $ 628,000 us-gaap_OtherAssetImpairmentCharges
Number of Investment Securities Sold | 54 cnob_NumberOfInvestmentSecuritiesSold | 170 cnob_NumberOfInvestmentSecuritiesSold

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- Definition Reclassification of available for sale investment securities to held to maturity at fair value. + References No definition available. + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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