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INVESTMENT SECURITIES (Details) - Schedule of realized gains and losses (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of realized gains and losses [Abstract] |  |  |
Proceeds | $ 81,844 cnob_ProceedsFromSaleOfInvestmentSecurities | $ 122,165 cnob_ProceedsFromSaleOfInvestmentSecurities | $ 130,059 cnob_ProceedsFromSaleOfInvestmentSecurities
Gross gains on sales of investment securities | 2,837 us-gaap_GainOnSaleOfInvestments | 2,451 us-gaap_GainOnSaleOfInvestments | 2,905 us-gaap_GainOnSaleOfInvestments
Gross losses on sales of investment securities | 19 us-gaap_LossOnSaleOfInvestments | 88 us-gaap_LossOnSaleOfInvestments | 23 us-gaap_LossOnSaleOfInvestments
Net gains on sales of investment securities | 2,818 us-gaap_GainLossOnSaleOfInvestments | 2,363 us-gaap_GainLossOnSaleOfInvestments | 2,882 us-gaap_GainLossOnSaleOfInvestments
Less: tax provision on net gains | (986)cnob_TaxProvisionOnGainOnSaleOfInvestments | (645)cnob_TaxProvisionOnGainOnSaleOfInvestments | (879)cnob_TaxProvisionOnGainOnSaleOfInvestments
Net gains on sales of investment securities | $ 1,832 cnob_GainLossOnSaleOfInvestmentsNetOfTax | $ 1,718 cnob_GainLossOnSaleOfInvestmentsNetOfTax | $ 2,003 cnob_GainLossOnSaleOfInvestmentsNetOfTax

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- Definition Gain loss on sale of investments net of tax. + References No definition available. + Details
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- Definition Proceeds from sale of investment securities. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
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- Details
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- Definition Tax provision on gain on sale of investments. + References No definition available. + Details
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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + 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
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- Definition The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
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- Definition The difference between the carrying value and the sale price of an investment. A loss would be recognized when the sale price of the investment is less than the carrying value of the investment. This element refers to the Loss included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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