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INVESTMENT SECURITIES (Details) - Investments classified by maturity date (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Investment Securities Available-for-Sale: |  |
Due in one year or less | $ 12,903 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost |
Due in one year or less | 13,054 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue |
Due after one year through five years | 42,369 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost |
Due after one year through five years | 43,670 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |
Due after five years through ten years | 93,793 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost |
Due after five years through ten years | 98,615 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |
Due after ten years | 57,201 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost |
Due after ten years | 57,592 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue |
Total | 281,461 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 319,147 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Total | 289,532 cnob_SecuritiesAvailableForSaleNet |
Investment Securities Held-to-Maturity: |  |
Due in one year or less | 5,001 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount |
Due in one year or less | 5,054 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue |
Due after one year through five years | 9,211 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount |
Due after one year through five years | 9,367 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |
Due after five years through ten years | 70,030 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount |
Due after five years through ten years | 72,302 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |
Due after ten years | 130,219 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount |
Due after ten years | 134,423 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue |
Total | 224,682 us-gaap_HeldToMaturitySecurities | 215,286 us-gaap_HeldToMaturitySecurities
Total | 231,445 us-gaap_HeldToMaturitySecuritiesFairValue | 210,958 us-gaap_HeldToMaturitySecuritiesFairValue
Total investment securities | 506,143 us-gaap_MarketableSecurities |
Total investment securities | 520,977 cnob_MarketableSecuritiesFairValueDisclosure |
Residential Mortgage Backed Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale: amortized cost | 58,836 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember |
Investment Securities Available-for-Sale: fair value | 60,356 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember |
Total | 58,836 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 48,312 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity: |  |
Investment Securities Held-to-Maturity: amoritzed cost | 5,955 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember |
Investment Securities Held-to-Maturity: fair value | 5,983 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember |
Total | 5,983 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 2,182 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Commercial Mortgage Backed Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale: amortized cost | 3,042 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
Investment Securities Available-for-Sale: fair value | 3,046 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
Total | 3,042 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 7,145 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Investment Securities Held-to-Maturity: |  |
Investment Securities Held-to-Maturity: amoritzed cost | 4,266 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
Investment Securities Held-to-Maturity: fair value | 4,316 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
Total | 4,316 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 4,396 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Equity Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale: amortized cost | 376 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Investment Securities Available-for-Sale: fair value | 307 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Total | 376 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 376 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Other Securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Investment Securities Available-for-Sale: amortized cost | 12,941 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember |
Investment Securities Available-for-Sale: fair value | 12,892 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember |
Total | $ 12,941 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | $ 5,671 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember

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