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INVESTMENT SECURITIES (Details) - Unrealized gains on investment securities (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | $ 281,461 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 319,147 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Investment Securities Available-for-Sale, Gross Unrealized Gains | 8,596 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments | 6,960 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
Investment Securities Available-for-Sale, Gross Unrealized Losses | (525)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments | (3,037)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
Investment Securities Available-for-Sale, Fair Value | 289,532 us-gaap_AvailableForSaleSecurities | 323,070 us-gaap_AvailableForSaleSecurities
Investment Securities Held-to-Maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 224,682 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment | 215,286 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 6,858 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain | 1,516 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (95)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss | (5,844)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss
Investment Securities Held-to-Maturity, Fair Value | 231,445 us-gaap_HeldToMaturitySecuritiesFairValue | 210,958 us-gaap_HeldToMaturitySecuritiesFairValue
Total, Amortized Cost | 506,143 cnob_TotalInvestmentSecuritiesAmortizedCost | 534,433 cnob_TotalInvestmentSecuritiesAmortizedCost
Total, Gross Unrealized Gains | 15,454 cnob_TotalInvestmentSecuritiesGrossUnrealizedGains | 8,476 cnob_TotalInvestmentSecuritiesGrossUnrealizedGains
Total, Gross Unrealized Losses | (620)cnob_TotalInvestmentSecuritiesGrossUnrealizedLosses | (8,881)cnob_TotalInvestmentSecuritiesGrossUnrealizedLosses
Total, Fair Value | 520,977 cnob_TotalInvestmentSecuritiesFairValue | 534,028 cnob_TotalInvestmentSecuritiesFairValue
Federal Agency Obligations [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 32,650 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 20,567 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 217 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 29 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (50)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | (655)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale, Fair Value | 32,817 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 19,941 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 27,103 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 15,249 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 322 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 23 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (28)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | (389)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity, Fair Value | 27,397 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 14,883 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Residential Mortgage Backed Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 58,836 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 48,312 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 1,531 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 791 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (11)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | (229)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale, Fair Value | 60,356 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 48,874 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 5,955 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 2,246 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 28 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember |
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (64)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity, Fair Value | 5,983 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 2,182 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Commercial Mortgage Backed Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 3,042 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 7,145 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 4 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 3 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses |  | (157)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale, Fair Value | 3,046 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 6,991 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 4,266 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 4,417 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 50 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 41 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (62)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity, Fair Value | 4,316 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 4,396 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
US States and Political Subdivisions Debt Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 8,201 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 30,804 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 205 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 711 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Available-for-Sale, Gross Unrealized Losses |  | (55)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Available-for-Sale, Fair Value | 8,406 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 31,460 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 120,144 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 127,418 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 4,512 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 1,303 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (60)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | (3,688)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity, Fair Value | 124,596 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 125,033 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Trust Preferred Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 16,086 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | 19,763 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 489 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | 150 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (269)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | (510)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale, Fair Value | 16,306 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | 19,403 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember
Corporate Bonds and Notes [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 119,838 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 154,182 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 5,950 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 4,930 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (11)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | (482)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale, Fair Value | 125,777 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 158,630 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 38,950 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 37,900 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 1,026 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 149 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (7)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | (622)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity, Fair Value | 39,969 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 37,427 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Asset-backed Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 27,393 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 15,733 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 140 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 246 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (31)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Investment Securities Available-for-Sale, Fair Value | 27,502 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 15,979 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Certificate of Deposit [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 2,098 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CertificateOfDepositMember | 2,250 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CertificateOfDepositMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 27 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CertificateOfDepositMember | 32 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CertificateOfDepositMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (2)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CertificateOfDepositMember | (20)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CertificateOfDepositMember
Investment Securities Available-for-Sale, Fair Value | 2,123 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CertificateOfDepositMember | 2,262 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CertificateOfDepositMember
Equity Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 376 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 376 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (69)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | (89)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Investment Securities Available-for-Sale, Fair Value | 307 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 287 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Other Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 12,941 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | 5,671 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 33 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | 68 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (82)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | (15)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale, Fair Value | 12,892 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | 5,724 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember
US Treasury Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale, Amortized Cost |  | 14,344 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses |  | (825)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Investment Securities Available-for-Sale, Fair Value |  | 13,519 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Investment Securities Held-to-Maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 28,264 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | 28,056 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 920 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember |
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (1,019)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Investment Securities Held-to-Maturity, Fair Value | $ 29,184 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | $ 27,037 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember

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