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Note 21 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) - Collateral Pledged [Member] - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Impaired Financing Receivable, with Related Allowance, Recorded Investment 1 | $ 4.7 | $ 9.0
Impaired Financing Receivable, Related Allowance 1 | $ 1.1 | $ 1.3

X
- Definition Amount of allowance for credit losses related to recorded investment. + References No definition available. + Details
Name: | cnob_ImpairedFinancingReceivableRelatedAllowance1
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References No definition available. + Details
Name: | cnob_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment1
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_CollateralPledgedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |