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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Number of offices merge | 23 cnob_NumberOfOfficesMerge |  |
Number of Operating Segments | 1 us-gaap_NumberOfOperatingSegments | 1 us-gaap_NumberOfOperatingSegments |
Maximum Maturity of Cash and Cash Equivalents | 90 years |  |
Asset Impairment Charges | $ 0 us-gaap_AssetImpairmentCharges | $ 700,000 us-gaap_AssetImpairmentCharges | $ 900,000 us-gaap_AssetImpairmentCharges
Number of Segments of Loans and Leases | 5 cnob_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 | 250,000 cnob_ThresholdAmountOfLoanForEvaluationOfImpairment |  |
Rolling Calculations Years | 3 years |  |
Life Insurance, Corporate or Bank Owned, Amount | $ 0 us-gaap_LifeInsuranceCorporateOrBankOwnedAmount | $ 8,400,000 us-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 |  |

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- Definition Loans delinquent period. + References No definition available. + Details
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- Definition Maximum maturity of cash and cash equivalents. + References No definition available. + Details
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- Definition Non accrual contractual due. + References No definition available. + Details
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- Definition Non accrual payment status. + References No definition available. + Details
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- Definition Number of offices merge. + References No definition available. + Details
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- Definition Number of segments of loans and leases. + References No definition available. + Details
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- Definition Threshold amount of loan for evaluation of impairment. + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for Medicare prescription drug benefit subsidy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6384206&loc=d3e41899-111602 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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