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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) $ 11,250,000cnob_NonvotingSeniorPreferredStockIssuedValue $ 10,000,000cnob_NonvotingSeniorPreferredStockIssuedValue        
Warrants issued to treasury for purchase of common stock, shares (in Shares)   173,410cnob_WarrantsIssuedToTreasuryForPurchaseOfCommonStockShares        
Exercise price of warrants issued for common stock (in Dollars per share)   $ 8.65cnob_ExercisePriceOfWarrantsIssuedForCommonStock        
Date rights offering was complete     October 2009      
Number of shares underlying the warrants held by Treasury (in Shares)   86,705cnob_NumberOfSharesUnderlyingWarrantsHeldByTreasury        
Percentage of original amount of warrants left   50.00%cnob_PercentageOfOriginalAmountOfWarrantsLeft        
Tier One Leverage Capital (in Dollars) 1,250,000us-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) 11,250,000us-gaap_PaymentsForRepurchaseOfTrustPreferredSecurities          
Payments for Repurchase of Warrants (in Dollars)         245,000us-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)     5,000,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities 5,000,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities   5,200,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities
Series B [Member]            
STOCKHOLDERS' EQUITY AND REGULATORY REQUIREMENTS (Details) [Line Items]            
Convertible Preferred Stock, Shares Issued upon Conversion (in Shares) 11,250us-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) $ 1,000us-gaap_PreferredStockRedemptionPricePerShare
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= us-gaap_SeriesAMember
         
Fixed Rate Cumulative Perpetual Preferred Stock Redemption Shares (in Shares) 10,000cnob_FixedRateCumulativePerpetualPreferredStockRedemptionShares
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= us-gaap_SeriesAMember
         
Preferred Stock, Redemption Amount (in Dollars) $ 10,041,667us-gaap_PreferredStockRedemptionAmount
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= us-gaap_SeriesAMember