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Investment Securities (Details) - Schedule of unrealized losses not recognized in income (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Investment securities available-for-sale:    
Investment Securities Available-for-Sale: Total, Fair Value $ 23,626us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue $ 31,583us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Investment Securities Available-for-Sale: Total, Unrealized Losses (504)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments (525)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 16,233us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue 22,545us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (117)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments (85)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
Investment Securities Available-for-Sale: 12 Months or Longer, Fair Value 7,393us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 9,038us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Investment Securities Available-for-Sale: 12 Months or Longer, Unrealized Losses (387)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments (440)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
Investment securities held-to-maturity:    
Investment Securities Held-to-Maturity: Total, Fair Value 21,138us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue 12,562us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
Investment Securities Held-to-Maturity: Total, Unrealized Losses (100)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross (95)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
Investment Securities Held-to-Maturity: Less than 12 Months, Fair Value 21,138us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue 5,622us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Investment Securities Held-to-Maturity: Less than 12 Months, Unrealized Losses (100)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss (38)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Investment Securities Held-to-Maturity: 12 Months or Longer, Fair Value   6,940us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Investment Securities Held-to-Maturity: 12 Months or Longer, Unrealized Losses   (57)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Fair Value, Total 44,764cnob_TemporarilyImpairedSecuritiesTotalFairValue 44,145cnob_TemporarilyImpairedSecuritiesTotalFairValue
Unrealized Losses, Total (604)cnob_TemporarilyImpairedSecuritiesTotalUnrealizedLosses (620)cnob_TemporarilyImpairedSecuritiesTotalUnrealizedLosses
Fair Value, Less than 12 Months 37,371cnob_TemporarilyImpairedSecuritiesLessThan12MonthsFairValue 28,167cnob_TemporarilyImpairedSecuritiesLessThan12MonthsFairValue
Unrealized Losses, Less than 12 Months (217)cnob_TemporarilyImpairedSecuritiesLessThan12MonthsAggregateLosses (123)cnob_TemporarilyImpairedSecuritiesLessThan12MonthsAggregateLosses
Fair Value, 12 Months or Longer 7,393cnob_TemporarilyImpairedSecurities12MonthsOrLongerFairValue 15,978cnob_TemporarilyImpairedSecurities12MonthsOrLongerFairValue
Unrealized Losses, 12 Months or Longer (387)cnob_TemporarilyImpairedSecurities12MonthsOrLongerAggregateLosses (497)cnob_TemporarilyImpairedSecurities12MonthsOrLongerAggregateLosses
Federal Agency Obligations [Member]    
Investment securities available-for-sale:    
Investment Securities Available-for-Sale: Total, Fair Value 1,656us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
6,755us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (4)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
(50)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 1,357us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
2,770us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (1)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
(9)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale: 12 Months or Longer, Fair Value 299us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
3,985us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale: 12 Months or Longer, Unrealized Losses (3)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
(41)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment securities held-to-maturity:    
Investment Securities Held-to-Maturity: Total, Fair Value 6,422us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
3,228us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity: Total, Unrealized Losses (30)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
(28)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity: Less than 12 Months, Fair Value 6,422us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
3,228us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity: Less than 12 Months, Unrealized Losses (30)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
(28)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Residential Mortgage Backed Securities [Member]    
Investment securities available-for-sale:    
Investment Securities Available-for-Sale: Total, Fair Value 1,026us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
5,694us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (9)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
(11)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 1,026us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
5,694us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (9)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
(11)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment securities held-to-maturity:    
Investment Securities Held-to-Maturity: Total, Fair Value 3,660us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Investment Securities Held-to-Maturity: Total, Unrealized Losses (13)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Investment Securities Held-to-Maturity: Less than 12 Months, Fair Value 3,660us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Investment Securities Held-to-Maturity: Less than 12 Months, Unrealized Losses (13)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Trust Preferred Securities [Member]    
Investment securities available-for-sale:    
Investment Securities Available-for-Sale: Total, Fair Value 1,297us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
1,307us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (278)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
(269)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Fair Value 1,297us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
1,307us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Unrealized Losses (278)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
(269)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Corporate Bonds and Notes [Member]    
Investment securities available-for-sale:    
Investment Securities Available-for-Sale: Total, Fair Value 3,935us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
1,961us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (22)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
(11)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 3,935us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
1,961us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (22)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
(11)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment securities held-to-maturity:    
Investment Securities Held-to-Maturity: Total, Fair Value 3,720us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
993us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity: Total, Unrealized Losses (11)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
(7)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity: Less than 12 Months, Fair Value 3,720us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
993us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity: Less than 12 Months, Unrealized Losses (11)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
(7)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Asset-backed Securities [Member]    
Investment securities available-for-sale:    
Investment Securities Available-for-Sale: Total, Fair Value 9,698us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
9,773us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (80)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
(31)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 9,698us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
9,773us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (80)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
(31)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Certificates of Deposit [Member]    
Investment securities available-for-sale:    
Investment Securities Available-for-Sale: Total, Fair Value 217us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember
369us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (5)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember
(2)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 217us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember
369us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (5)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember
(2)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember
Equity Securities [Member]    
Investment securities available-for-sale:    
Investment Securities Available-for-Sale: Total, Fair Value 320us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
307us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (56)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
(69)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Fair Value 320us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
307us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Unrealized Losses (56)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
(69)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Other Securities [Member]    
Investment securities available-for-sale:    
Investment Securities Available-for-Sale: Total, Fair Value 5,477us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
5,417us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (50)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
(82)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value   1,978us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses   (21)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Fair Value 5,477us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
3,439us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Unrealized Losses (50)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
(61)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
Obligation of U.S. States and Political Subdivisions [Member]    
Investment securities held-to-maturity:    
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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8,341us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Investment Securities Held-to-Maturity: Total, Unrealized Losses (46)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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(60)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Investment Securities Held-to-Maturity: Less than 12 Months, Fair Value 7,336us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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1,401us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
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Investment Securities Held-to-Maturity: Less than 12 Months, Unrealized Losses (46)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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(3)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Investment Securities Held-to-Maturity: 12 Months or Longer, Fair Value   6,940us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_ObligationOfUsStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity: 12 Months or Longer, Unrealized Losses   $ (57)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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