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STOCK BASED COMPENSATION (Details) - Disclosure related to stock option plan (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
2014 |  |  |
Intrinsic value of options exercised | $ 1,011,000 cnob_IntrinsicValueOfOptionsExercised |  |
Cash received from options exercised | 885,000 us-gaap_ProceedsFromStockOptionsExercised | 21,000 us-gaap_ProceedsFromStockOptionsExercised | 141,000 us-gaap_ProceedsFromStockOptionsExercised
Tax benefit realized from options exercised | $ 282,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | $ 16,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | $ 28,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities

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- Definition Intrinsic value of options exercised. + References No definition available. + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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