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Investment Securities (Details) - Schedule of realized gains and losses (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Schedule of realized gains and losses [Abstract] |  |
Proceeds | $ 9,537 cnob_ProceedsFromSaleOfInvestmentSecurities | $ 50,611 cnob_ProceedsFromSaleOfInvestmentSecurities
Gross gains on sales of investment securities | 506 us-gaap_GainOnSaleOfInvestments | 1,432 us-gaap_GainOnSaleOfInvestments
Gross losses on sales of investment securities |  | (17)us-gaap_LossOnSaleOfInvestments
Net gains on sales of investment securities | 506 us-gaap_GainLossOnSaleOfInvestments | 1,415 us-gaap_GainLossOnSaleOfInvestments
Less: tax provision on net gains | 207 cnob_TaxProvisionOnGainOnSaleOfInvestments | 380 cnob_TaxProvisionOnGainOnSaleOfInvestments
Total | $ 299 cnob_GainLossOnSaleOfInvestmentsNetOfTax | $ 1,035 cnob_GainLossOnSaleOfInvestmentsNetOfTax

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- Definition Gain loss on sale of investments net of tax. + References No definition available. + Details
Name: | cnob_GainLossOnSaleOfInvestmentsNetOfTax
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Proceeds from sale of investment securities. + References No definition available. + Details
Name: | cnob_ProceedsFromSaleOfInvestmentSecurities
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Tax provision on gain on sale of investments. + References No definition available. + Details
Name: | cnob_TaxProvisionOnGainOnSaleOfInvestments
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | us-gaap_GainOnSaleOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | us-gaap_LossOnSaleOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration