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Investment Securities (Details) - Schedule of preferred security and associated ratings (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
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Mar. 31, 2015 | Dec. 31, 2014
Investment Securities (Details) - Schedule of preferred security and associated ratings [Line Items] |  |
Available-for-sale Securities, Amortized Cost | $ 267,047 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 281,461 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Fair Value | 276,121 us-gaap_AvailableForSaleSecurities | 289,532 us-gaap_AvailableForSaleSecurities
Trust Preferred Securities [Member] | Additional Deal Value [Member] | Countrywide Capital V [Member] |  |
Investment Securities (Details) - Schedule of preferred security and associated ratings [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 250 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = cnob_AdditionalDealValueMember / dei_LegalEntityAxis = cnob_CountrywideCapitalVMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Fair Value | 259 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = cnob_AdditionalDealValueMember / dei_LegalEntityAxis = cnob_CountrywideCapitalVMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 9 us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / us-gaap_InvestmentTypeAxis = cnob_AdditionalDealValueMember / dei_LegalEntityAxis = cnob_CountrywideCapitalVMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Lowest Credit Rating Assigned | BB |
Trust Preferred Securities [Member] | Additional Deal Value [Member] | Morgan Stanley Cap Trust IV [Member] |  |
Investment Securities (Details) - Schedule of preferred security and associated ratings [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 1,743 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = cnob_AdditionalDealValueMember / dei_LegalEntityAxis = cnob_MorganStanleyCapTrustIvMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Fair Value | 1,795 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = cnob_AdditionalDealValueMember / dei_LegalEntityAxis = cnob_MorganStanleyCapTrustIvMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 52 us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / us-gaap_InvestmentTypeAxis = cnob_AdditionalDealValueMember / dei_LegalEntityAxis = cnob_MorganStanleyCapTrustIvMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Lowest Credit Rating Assigned | BB |
Trust Preferred Securities [Member] | Countrywide Capital IV [Member] |  |
Investment Securities (Details) - Schedule of preferred security and associated ratings [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 1,771 us-gaap_AvailableForSaleSecuritiesAmortizedCost / dei_LegalEntityAxis = cnob_CountrywideCapitalIvMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Fair Value | 1,819 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = cnob_CountrywideCapitalIvMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 48 us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / dei_LegalEntityAxis = cnob_CountrywideCapitalIvMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Lowest Credit Rating Assigned | BB |
Trust Preferred Securities [Member] | Countrywide Capital V [Member] |  |
Investment Securities (Details) - Schedule of preferred security and associated ratings [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 2,747 us-gaap_AvailableForSaleSecuritiesAmortizedCost / dei_LegalEntityAxis = cnob_CountrywideCapitalVMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Fair Value | 2,848 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = cnob_CountrywideCapitalVMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 101 us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / dei_LegalEntityAxis = cnob_CountrywideCapitalVMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Lowest Credit Rating Assigned | BB |
Trust Preferred Securities [Member] | Nationsbank Cap Trust III [Member] |  |
Investment Securities (Details) - Schedule of preferred security and associated ratings [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 1,575 us-gaap_AvailableForSaleSecuritiesAmortizedCost / dei_LegalEntityAxis = cnob_NationsbankCapTrustIiiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Fair Value | 1,297 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = cnob_NationsbankCapTrustIiiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | (278)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / dei_LegalEntityAxis = cnob_NationsbankCapTrustIiiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Lowest Credit Rating Assigned | BB |
Trust Preferred Securities [Member] | Morgan Stanley Cap Trust IV [Member] |  |
Investment Securities (Details) - Schedule of preferred security and associated ratings [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 2,500 us-gaap_AvailableForSaleSecuritiesAmortizedCost / dei_LegalEntityAxis = cnob_MorganStanleyCapTrustIvMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Fair Value | 2,567 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = cnob_MorganStanleyCapTrustIvMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 67 us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / dei_LegalEntityAxis = cnob_MorganStanleyCapTrustIvMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Lowest Credit Rating Assigned | BB |
Trust Preferred Securities [Member] | Goldman Sachs [Member] |  |
Investment Securities (Details) - Schedule of preferred security and associated ratings [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 1,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / dei_LegalEntityAxis = cnob_GoldmanSachsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Fair Value | 1,252 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = cnob_GoldmanSachsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 252 us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / dei_LegalEntityAxis = cnob_GoldmanSachsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Lowest Credit Rating Assigned | BB |
Trust Preferred Securities [Member] | Stifel Financial [Member] |  |
Investment Securities (Details) - Schedule of preferred security and associated ratings [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 4,500 us-gaap_AvailableForSaleSecuritiesAmortizedCost / dei_LegalEntityAxis = cnob_StifelFinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Fair Value | 4,619 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = cnob_StifelFinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 119 us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / dei_LegalEntityAxis = cnob_StifelFinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |
Lowest Credit Rating Assigned | BBB- |
Trust Preferred Securities [Member] |  |
Investment Securities (Details) - Schedule of preferred security and associated ratings [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 16,086 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | 16,086 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember
Available-for-sale Securities, Fair Value | 16,456 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | 16,306 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember
Available-for-sale Securities, Gross Unrealized Gain (Loss) | $ 370 us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember |

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- Definition Investment securities credit rating. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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