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STOCKHOLDERS' EQUITY AND REGULATORY REQUIREMENTS (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 15, 2011 | Jan. 12, 2009 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011 | Dec. 31, 2003
STOCKHOLDERS' EQUITY AND REGULATORY REQUIREMENTS (Details) [Line Items] |  |  |  |  |  |
Nonvoting senior preferred stock issued, value (in Dollars) | $ 11,250,000 cnob_NonvotingSeniorPreferredStockIssuedValue | $ 10,000,000 cnob_NonvotingSeniorPreferredStockIssuedValue |  |  |  |
Warrants issued to treasury for purchase of common stock, shares (in Shares) |  | 173,410 cnob_WarrantsIssuedToTreasuryForPurchaseOfCommonStockShares |  |  |  |
Exercise price of warrants issued for common stock (in Dollars per share) |  | $ 8.65 cnob_ExercisePriceOfWarrantsIssuedForCommonStock |  |  |  |
Date rights offering was complete |  |  | October 2009 |  |  |
Number of shares underlying the warrants held by Treasury (in Shares) |  | 86,705 cnob_NumberOfSharesUnderlyingWarrantsHeldByTreasury |  |  |  |
Percentage of original amount of warrants left |  | 50.00%cnob_PercentageOfOriginalAmountOfWarrantsLeft |  |  |  |
Tier One Leverage Capital (in Dollars) | 1,250,000 us-gaap_TierOneLeverageCapital |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 1.00%us-gaap_PreferredStockDividendRatePercentage |  |  |  |  |
Preferred Stock Increase Dividend Rate Percentage | 9.00%cnob_PreferredStockIncreaseDividendRatePercentage |  |  |  |  |
Payments for Repurchase of Trust Preferred Securities (in Dollars) | 11,250,000 us-gaap_PaymentsForRepurchaseOfTrustPreferredSecurities |  |  |  |  |
Payments for Repurchase of Warrants (in Dollars) |  |  |  |  | 245,000 us-gaap_PaymentsForRepurchaseOfWarrants |
Tier One Leverage Capital Required for Capital Adequacy to Average Assets |  |  | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets |  |  |
Tier One Leverage Capital to Average Assets |  |  | 4.00%us-gaap_TierOneLeverageCapitalToAverageAssets |  |  |
Tier One Leverage Capital Required to be Well Capitalized to Average Assets |  |  | 8.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets |  |  |
Tier One Risk Based Capital to Risk Weighted Assets |  |  | 5.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets |  |  |
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets |  |  | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets |  |  |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets |  |  | 10.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets |  |  |
Proceeds from Issuance of Trust Preferred Securities (in Dollars) |  |  | 5,000,000 us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities | 5,000,000 us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities |  | 5,200,000 us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities
Series B [Member] |  |  |  |  |  |
STOCKHOLDERS' EQUITY AND REGULATORY REQUIREMENTS (Details) [Line Items] |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in Shares) | 11,250 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = us-gaap_SeriesBMember |  |  |  |  |
Series A [Member] |  |  |  |  |  |
STOCKHOLDERS' EQUITY AND REGULATORY REQUIREMENTS (Details) [Line Items] |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share (in Dollars per share) | $ 1,000 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = us-gaap_SeriesAMember |  |  |  |  |
Fixed Rate Cumulative Perpetual Preferred Stock Redemption Shares (in Shares) | 10,000 cnob_FixedRateCumulativePerpetualPreferredStockRedemptionShares / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = us-gaap_SeriesAMember |  |  |  |  |
Preferred Stock, Redemption Amount (in Dollars) | $ 10,041,667 us-gaap_PreferredStockRedemptionAmount / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = us-gaap_SeriesAMember |  |  |  |  |

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- Definition Fixed rate cumulative perpetual preferred stock redemption shares. + References No definition available. + Details
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- Definition Nonvoting senior preferred stock issued, value. + References No definition available. + Details
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- Definition Number of shares underlying the warrants held by treasury. + References No definition available. + Details
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- Definition Warrants issued to treasury for purchase of common stock, shares. + References No definition available. + Details
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- Definition Number of shares issued for each share of convertible preferred stock that is converted. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 + Details
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- Definition The cash outflow to reacquire preferred stocks issued by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow from issuance of preferred stocks by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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