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INVESTMENT SECURITIES (Details) - Schedule of unrealized losses not recognized in income (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
INVESTMENT SECURITIES (Details) - Schedule of unrealized losses not recognized in income [Line Items]    
Investment Securities Available-for-Sale: Total, Fair Value $ 31,583us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue $ 95,763us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Investment Securities Available-for-Sale: Total, Unrealized Losses (525)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments (3,037)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 22,545us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue 91,251us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (85)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments (2,600)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
Investment Securities Available-for-Sale: 12 Months or Longer, Fair Value 9,038us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 4,512us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Investment Securities Available-for-Sale: 12 Months or Longer, Unrealized Losses (440)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments (437)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
Investment Securities Held-to-Maturity: Total, Fair Value 12,562us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue 137,350us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
Investment Securities Held-to-Maturity: Total, Unrealized Losses (95)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross (5,844)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
Investment Securities Held-to-Maturity: Less than 12 Months, Fair Value 5,622us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue 128,093us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Investment Securities Held-to-Maturity: Less than 12 Months, Unrealized Losses (38)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss (5,112)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Investment Securities Held-to-Maturity: 12 Months or Longer, Fair Value 6,940us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 9,257us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Investment Securities Held-to-Maturity: 12 Months or Longer, Unrealized Losses (57)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss (732)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Total Temporarily Impaired Securities, Total, Fair Value 44,145cnob_TemporarilyImpairedSecuritiesTotalFairValue 233,113cnob_TemporarilyImpairedSecuritiesTotalFairValue
Total Temporarily Impaired Securities, Total, Unrealized Losses (620)cnob_TemporarilyImpairedSecuritiesTotalUnrealizedLosses (8,881)cnob_TemporarilyImpairedSecuritiesTotalUnrealizedLosses
Total Temporarily Impaired Securities, Less than 12 Months, Fair Value 28,167cnob_TemporarilyImpairedSecuritiesLessThan12MonthsFairValue 219,344cnob_TemporarilyImpairedSecuritiesLessThan12MonthsFairValue
Total Temporarily Impaired Securities, Less than 12 Months, Unrealized Losses (123)cnob_TemporarilyImpairedSecuritiesLessThan12MonthsAggregateLosses (7,712)cnob_TemporarilyImpairedSecuritiesLessThan12MonthsAggregateLosses
Total Temporarily Impaired Securities, 12 Months or Longer, Fair Value 15,978cnob_TemporarilyImpairedSecurities12MonthsOrLongerFairValue 13,769cnob_TemporarilyImpairedSecurities12MonthsOrLongerFairValue
Total Temporarily Impaired Securities, 12 Months or Longer, Unrealized Losses (497)cnob_TemporarilyImpairedSecurities12MonthsOrLongerAggregateLosses (1,169)cnob_TemporarilyImpairedSecurities12MonthsOrLongerAggregateLosses
Federal Agency Obligations [Member]    
INVESTMENT SECURITIES (Details) - Schedule of unrealized losses not recognized in income [Line Items]    
Investment Securities Available-for-Sale: Total, Fair Value 6,755us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
17,200us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (50)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
(655)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 2,770us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
17,200us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (9)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
(655)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Available-for-Sale: 12 Months or Longer, Fair Value 3,985us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
 
Investment Securities Available-for-Sale: 12 Months or Longer, Unrealized Losses (41)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
 
Investment Securities Held-to-Maturity: Total, Fair Value 3,228us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
13,492us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity: Total, Unrealized Losses (28)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
(389)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity: Less than 12 Months, Fair Value 3,228us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
13,197us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity: Less than 12 Months, Unrealized Losses (28)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
(388)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity: 12 Months or Longer, Fair Value   295us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Investment Securities Held-to-Maturity: 12 Months or Longer, Unrealized Losses   (1)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Residential Mortgage Backed Securities [Member]    
INVESTMENT SECURITIES (Details) - Schedule of unrealized losses not recognized in income [Line Items]    
Investment Securities Available-for-Sale: Total, Fair Value 5,694us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
18,293us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (11)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
(229)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 5,694us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
18,293us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (11)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
(229)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity: Total, Fair Value   2,182us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity: Total, Unrealized Losses   (64)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity: Less than 12 Months, Fair Value   2,182us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity: Less than 12 Months, Unrealized Losses   (64)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Trust Preferred Securities [Member]    
INVESTMENT SECURITIES (Details) - Schedule of unrealized losses not recognized in income [Line Items]    
Investment Securities Available-for-Sale: Total, Fair Value 1,307us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
5,306us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (269)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
(510)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value   4,031us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses   (211)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Fair Value 1,307us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
1,275us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Unrealized Losses (269)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
(299)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Corporate Bonds and Notes [Member]    
INVESTMENT SECURITIES (Details) - Schedule of unrealized losses not recognized in income [Line Items]    
Investment Securities Available-for-Sale: Total, Fair Value 1,961us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
32,498us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (11)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
(482)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 1,961us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
30,533us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (11)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
(448)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Fair Value   1,965us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Unrealized Losses   (34)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity: Total, Fair Value 993us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
27,210us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity: Total, Unrealized Losses (7)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
(622)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity: Less than 12 Months, Fair Value 993us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
27,210us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Investment Securities Held-to-Maturity: Less than 12 Months, Unrealized Losses (7)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
(622)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Asset-backed Securities [Member]    
INVESTMENT SECURITIES (Details) - Schedule of unrealized losses not recognized in income [Line Items]    
Investment Securities Available-for-Sale: Total, Fair Value 9,773us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Investment Securities Available-for-Sale: Total, Unrealized Losses (31)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 9,773us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (31)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Certificate of Deposit [Member]    
INVESTMENT SECURITIES (Details) - Schedule of unrealized losses not recognized in income [Line Items]    
Investment Securities Available-for-Sale: Total, Fair Value 369us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CertificateOfDepositMember
552us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CertificateOfDepositMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (2)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CertificateOfDepositMember
(20)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CertificateOfDepositMember
Investment Securities Available-for-Sale: Less than 12 Months, Fair Value 369us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CertificateOfDepositMember
552us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CertificateOfDepositMember
Investment Securities Available-for-Sale: Less than 12 Months, Unrealized Losses (2)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CertificateOfDepositMember
(20)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CertificateOfDepositMember
Equity Securities [Member]    
INVESTMENT SECURITIES (Details) - Schedule of unrealized losses not recognized in income [Line Items]    
Investment Securities Available-for-Sale: Total, Fair Value 307us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
287us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (69)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
(89)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Fair Value 307us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
287us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Investment Securities Available-for-Sale: 12 Months or Longer, Unrealized Losses (69)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
(89)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Other Securities [Member]    
INVESTMENT SECURITIES (Details) - Schedule of unrealized losses not recognized in income [Line Items]    
Investment Securities Available-for-Sale: Total, Fair Value 5,417us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
985us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
Investment Securities Available-for-Sale: Total, Unrealized Losses (82)cnob_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember
(15)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
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