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Investment Securities (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) Integer | Dec. 31, 2017 USD ($) Integer
Investments, Debt and Equity Securities [Abstract] |  |
Number of Investment Securities Sold | Integer | 148 | 112
Available-for-sale Securities Pledged as Collateral | $ | $ 151,500 | $ 157,800

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- Definition Number of investment securities sold. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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