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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Schedule of earnings per common share basic and diluted (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of earnings per common share basic and diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (in Dollars) | $ 8,023 us-gaap_NetIncomeLoss | $ 1,766 us-gaap_NetIncomeLoss | $ 4,378 us-gaap_NetIncomeLoss | $ 4,398 us-gaap_NetIncomeLoss | $ 4,984 us-gaap_NetIncomeLoss | $ 5,094 us-gaap_NetIncomeLoss | $ 4,923 us-gaap_NetIncomeLoss | $ 4,924 us-gaap_NetIncomeLoss | $ 18,565 us-gaap_NetIncomeLoss | $ 19,925 us-gaap_NetIncomeLoss | $ 17,507 us-gaap_NetIncomeLoss
Preferred stock dividends and accretion (in Dollars) |  |  |  |  |  |  |  |  | 112 us-gaap_PreferredStockDividendsAndOtherAdjustments | 141 us-gaap_PreferredStockDividendsAndOtherAdjustments | 281 us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income available to common stockholders (in Dollars) | $ 7,995 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,738 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,350 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,370 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,955 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 5,066 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,895 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,868 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 18,453 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 19,784 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 17,226 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Average number of common shares outstanding | 29,699,301 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 29,636,001 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,372,885 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,350,183 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,350,183 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,349,480 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,348,915 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,348,215 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 23,029,813 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,349,204 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,340,197 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive options |  |  |  |  |  |  |  |  | 449,000 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 37,000 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 11,000 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Average number of common shares outstanding used to calculate diluted earnings per common share | 30,149,244 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 30,108,103 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 16,430,376 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 16,405,540 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 16,396,931 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 16,385,155 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 16,375,774 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 16,373,588 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 23,479,074 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 16,385,692 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 16,351,046 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Anti-dilutive common shares outstanding |  |  |  |  |  |  |  |  |  | 14,000 cnob_AntiDilutiveCommonSharesOutstanding | 42,000 cnob_AntiDilutiveCommonSharesOutstanding
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Basic (in Dollars per share) | $ 0.27 us-gaap_EarningsPerShareBasic | $ 0.06 us-gaap_EarningsPerShareBasic | $ 0.27 us-gaap_EarningsPerShareBasic | $ 0.27 us-gaap_EarningsPerShareBasic | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.80 us-gaap_EarningsPerShareBasic | $ 1.21 us-gaap_EarningsPerShareBasic | $ 1.05 us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share) | $ 0.27 us-gaap_EarningsPerShareDiluted | $ 0.06 us-gaap_EarningsPerShareDiluted | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.27 us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 0.79 us-gaap_EarningsPerShareDiluted | $ 1.21 us-gaap_EarningsPerShareDiluted | $ 1.05 us-gaap_EarningsPerShareDiluted

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