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BUSINESS COMBINATIONS (Details) - Schedule of Operating Results Attributable to Business Combinations (USD $) In Thousands, except Per 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
BUSINESS COMBINATIONS (Details) - Schedule of Operating Results Attributable to Business Combinations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 28,580 us-gaap_InterestIncomeExpenseNet | $ 27,546 us-gaap_InterestIncomeExpenseNet | $ 11,668 us-gaap_InterestIncomeExpenseNet | $ 11,610 us-gaap_InterestIncomeExpenseNet | $ 11,866 us-gaap_InterestIncomeExpenseNet | $ 11,722 us-gaap_InterestIncomeExpenseNet | $ 11,228 us-gaap_InterestIncomeExpenseNet | $ 11,370 us-gaap_InterestIncomeExpenseNet | $ 79,399 us-gaap_InterestIncomeExpenseNet | $ 46,186 us-gaap_InterestIncomeExpenseNet | $ 43,496 us-gaap_InterestIncomeExpenseNet
Noninterest income |  |  |  |  |  |  |  |  | 7,498 us-gaap_NoninterestIncome | 6,851 us-gaap_NoninterestIncome | 7,210 us-gaap_NoninterestIncome
Net income | 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
Legacy ConnectOne [Member] |  |  |  |  |  |  |  |  |  |  |
BUSINESS COMBINATIONS (Details) - Schedule of Operating Results Attributable to Business Combinations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 107,988 us-gaap_InterestIncomeExpenseNet / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember | 95,749 us-gaap_InterestIncomeExpenseNet / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember |
Noninterest income |  |  |  |  |  |  |  |  | 8,244 us-gaap_NoninterestIncome / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember | 8,053 us-gaap_NoninterestIncome / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember |
Noninterest expense |  |  |  |  |  |  |  |  | (54,749)cnob_BusinessAcquisitionsProFormaNoninterestExpense / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember | (45,827)cnob_BusinessAcquisitionsProFormaNoninterestExpense / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember |
Net income |  |  |  |  |  |  |  |  | $ 45,981 us-gaap_NetIncomeLoss / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember | $ 35,984 us-gaap_NetIncomeLoss / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember |
Pro forma earnings per share from continuing operations: |  |  |  |  |  |  |  |  |  |  |
Basic (in Dollars per share) |  |  |  |  |  |  |  |  | $ 1.55 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember | $ 0.91 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember |
Diluted (in Dollars per share) |  |  |  |  |  |  |  |  | $ 1.53 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember | $ 0.90 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = cnob_LegacyConnectOneMember |

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