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Derivatives (Details) - Summary of cash flow hedges included in the consolidated balance sheets - Interest Rate Swap [Member] - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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DERIVATIVES (Details) - Summary of cash flow hedges included in the consolidated balance sheets [Line Items] |  |
Interest rate swaps related to FHLB advances included in assets, Notional Amount | $ 200,000 | $ 150,000
Interest rate swaps related to FHLB advances included in assets, Fair Value | $ (3,029) | $ (273)

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- Definition Cutstom Element. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References No definition available. + Details
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Namespace Prefix: | cnob_
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Balance Type: | debit
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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- Details
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