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Investment Securities (Details) - Unrealized gains on investment securities (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | $ 267,047 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 281,461 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Investment Securities Available-for-Sale, Gross Unrealized Gains | 9,578 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments | 8,596 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
Investment Securities Available-for-Sale, Gross Unrealized Losses | (504)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments | (525)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
Investment Securities Available-for-Sale, Fair Value | 276,121 us-gaap_AvailableForSaleSecurities | 289,532 us-gaap_AvailableForSaleSecurities
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 231,720 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment | 224,682 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 8,643 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain | 6,858 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (100)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss | (95)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss
Investment Securities Held-to-Maturity, Fair Value | 240,263 us-gaap_HeldToMaturitySecuritiesFairValue | 231,445 us-gaap_HeldToMaturitySecuritiesFairValue
Total, Amortized Cost | 498,767 cnob_TotalInvestmentSecuritiesAmortizedCost | 506,143 cnob_TotalInvestmentSecuritiesAmortizedCost
Total, Gross Unrealized Gains | 18,221 cnob_TotalInvestmentSecuritiesGrossUnrealizedGains | 15,454 cnob_TotalInvestmentSecuritiesGrossUnrealizedGains
Total, Gross Unrealized Losses | (604)cnob_TotalInvestmentSecuritiesGrossUnrealizedLosses | (620)cnob_TotalInvestmentSecuritiesGrossUnrealizedLosses
Total, Fair Value | 516,384 cnob_TotalInvestmentSecuritiesFairValue | 520,977 cnob_TotalInvestmentSecuritiesFairValue
Federal Agency Obligations [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 30,774 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 32,650 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 463 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 217 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (4)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | (50)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale, Fair Value | 31,233 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 32,817 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 35,393 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 27,103 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 586 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 322 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (30)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | (28)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity, Fair Value | 35,949 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 27,397 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 | 57,300 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 58,836 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 1,737 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 1,531 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (9)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | (11)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale, Fair Value | 59,028 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 60,356 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 5,542 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 5,955 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 26 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 28 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (13)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember |
Investment Securities Held-to-Maturity, Fair Value | 5,555 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 5,983 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 | 3,027 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 3,042 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 55 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 4 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale, Fair Value | 3,082 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 3,046 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 4,124 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 4,266 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 86 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 50 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity, Fair Value | 4,210 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 4,316 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 | 8,197 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 8,201 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 238 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 205 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Available-for-Sale, Fair Value | 8,435 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 8,406 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 119,384 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 120,144 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 4,966 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 4,512 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (46)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | (60)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity, Fair Value | 124,304 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 124,596 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 | 16,086 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 648 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | 489 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (278)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | (269)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale, Fair Value | 16,456 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | 16,306 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 | 110,671 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 119,838 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 6,190 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 5,950 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (22)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | (11)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale, Fair Value | 116,839 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 125,777 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 38,962 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 38,950 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 1,472 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 1,026 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (11)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | (7)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity, Fair Value | 40,423 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 39,969 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember
Asset-backed Securities [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 26,045 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 27,393 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 127 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 140 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (80)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | (31)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Investment Securities Available-for-Sale, Fair Value | 26,092 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 27,502 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Certificates of Deposit [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 2,097 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember | 2,098 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 31 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember | 27 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (5)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember | (2)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Investment Securities Available-for-Sale, Fair Value | 2,123 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember | 2,123 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
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 | (56)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | (69)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Investment Securities Available-for-Sale, Fair Value | 320 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 307 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Other Securities [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 12,474 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | 12,941 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Gains | 89 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | 33 cnob_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale, Gross Unrealized Losses | (50)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | (82)cnob_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale, Fair Value | 12,513 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | 12,892 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember
US Treasury Securities [Member] |  |
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 28,315 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | 28,264 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 1,507 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | 920 cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedGrossHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Investment Securities Held-to-Maturity, Fair Value | $ 29,822 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | $ 29,184 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember

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