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Fair Value Measurements and Fair Value of Financial Instruments (Details) - Schedule of fair value recurring basis - Municipal Securities [Member] - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Dec. 31, 2017
Balance of recurring Level 3 assets | $ 9,632 | $ 18,218
Principal paydowns | (191) | (8,586)
Balance of recurring Level 3 assets | $ 9,441 | $ 9,632

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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the Other assumptions market participants would use in pricing principal pay down. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Balance Type: |
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