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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
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Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale: Total, Fair Value | $ 23,626 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | $ 31,583 us-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 | 16,233 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | 22,545 us-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 | 7,393 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | 9,038 us-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 | 21,138 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue | 12,562 us-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 | 21,138 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | 5,622 us-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 |  | 6,940 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Investment Securities Held-to-Maturity: 12 Months or Longer, Unrealized Losses |  | (57)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Fair Value, Total | 44,764 cnob_TemporarilyImpairedSecuritiesTotalFairValue | 44,145 cnob_TemporarilyImpairedSecuritiesTotalFairValue
Unrealized Losses, Total | (604)cnob_TemporarilyImpairedSecuritiesTotalUnrealizedLosses | (620)cnob_TemporarilyImpairedSecuritiesTotalUnrealizedLosses
Fair Value, Less than 12 Months | 37,371 cnob_TemporarilyImpairedSecuritiesLessThan12MonthsFairValue | 28,167 cnob_TemporarilyImpairedSecuritiesLessThan12MonthsFairValue
Unrealized Losses, Less than 12 Months | (217)cnob_TemporarilyImpairedSecuritiesLessThan12MonthsAggregateLosses | (123)cnob_TemporarilyImpairedSecuritiesLessThan12MonthsAggregateLosses
Fair Value, 12 Months or Longer | 7,393 cnob_TemporarilyImpairedSecurities12MonthsOrLongerFairValue | 15,978 cnob_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 | 1,656 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 6,755 us-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 | 1,357 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 2,770 us-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 | 299 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 3,985 us-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 | 6,422 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 3,228 us-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 | 6,422 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 3,228 us-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 | 1,026 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 5,694 us-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 | 1,026 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 5,694 us-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 | 3,660 us-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 | 3,660 us-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 | 1,297 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | 1,307 us-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 | 1,297 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | 1,307 us-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 | 3,935 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 1,961 us-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 | 3,935 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 1,961 us-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 | 3,720 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 993 us-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 | 3,720 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 993 us-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 | 9,698 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 9,773 us-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 | 9,698 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 9,773 us-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 | 217 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember | 369 us-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 | 217 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember | 369 us-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 | 320 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 307 us-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 | 320 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 307 us-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 | 5,477 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | 5,417 us-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 |  | 1,978 us-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 | 5,477 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | 3,439 us-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: |  |
Investment Securities Held-to-Maturity: Total, Fair Value | 7,336 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_ObligationOfUsStatesAndPoliticalSubdivisionsMember | 8,341 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_ObligationOfUsStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity: Total, Unrealized Losses | (46)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_ObligationOfUsStatesAndPoliticalSubdivisionsMember | (60)cnob_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLossGross / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_ObligationOfUsStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity: Less than 12 Months, Fair Value | 7,336 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_ObligationOfUsStatesAndPoliticalSubdivisionsMember | 1,401 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_ObligationOfUsStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity: Less than 12 Months, Unrealized Losses | (46)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_ObligationOfUsStatesAndPoliticalSubdivisionsMember | (3)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_ObligationOfUsStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity: 12 Months or Longer, Fair Value |  | 6,940 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_ObligationOfUsStatesAndPoliticalSubdivisionsMember
Investment Securities Held-to-Maturity: 12 Months or Longer, Unrealized Losses |  | $ (57)cnob_HeldtomaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_ObligationOfUsStatesAndPoliticalSubdivisionsMember

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