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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Number of offices merge 23cnob_NumberOfOfficesMerge    
Number of Operating Segments 1us-gaap_NumberOfOperatingSegments 1us-gaap_NumberOfOperatingSegments  
Maximum Maturity of Cash and Cash Equivalents 90 years    
Asset Impairment Charges $ 0us-gaap_AssetImpairmentCharges $ 700,000us-gaap_AssetImpairmentCharges $ 900,000us-gaap_AssetImpairmentCharges
Number of Segments of Loans and Leases 5cnob_NumberOfSegmentsOfLoansAndLeases    
Loans Delinquent Period 90 days    
Non Accrual Contractual Due 90 days    
Non Accrual Payment Status 90 days    
Threshold Amount of Loan for Evaluation of Impairment 250,000cnob_ThresholdAmountOfLoanForEvaluationOfImpairment    
Rolling Calculations Years 3 years    
Life Insurance, Corporate or Bank Owned, Amount $ 0us-gaap_LifeInsuranceCorporateOrBankOwnedAmount $ 8,400,000us-gaap_LifeInsuranceCorporateOrBankOwnedAmount  
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent 50.00%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsMedicarePrescriptionDrugBenefit    
Land, Buildings and Improvements [Member] | Minimum [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 4 years    
Land, Buildings and Improvements [Member] | Maximum [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 39 years    
Furniture Fixtures and Equipment [Member] | Minimum [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Furniture Fixtures and Equipment [Member] | Maximum [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 10 years