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Note 7 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) - Collateral Pledged [Member] - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1	$ 25.5	$ 7.7
Impaired Financing Receivable, Related Allowance 1	$ 1.6	$ 1.4

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: