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Loans and the Allowance for Loan Losses (Details) - Schedule of accretable yield, or income expected to be collected - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Schedule of accretable yield, or income expected to be collected [Abstract] |  |  |  |
Balance at beginning of period | $ 1,637 | $ 1,259 | $ 1,134 | $ 1,387
New loans purchased |  |  | 1,286 |
Accretion of income | (167) | (63) | (950) | (191)
Balance at end of period | $ 1,470 | $ 1,196 | $ 1,470 | $ 1,196

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- Definition Loans and leases receivable purchased loans. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Loans and leases receivable purchased loans accretion of income. + References No definition available. + Details
Name: | cnob_LoansAndLeasesReceivablePurchasedLoansAccretionOfIncome
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | cnob_ScheduleOfAccretableYieldOrIncomeExpectedToBeCollectedAbstract
Namespace Prefix: | cnob_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration