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Note 7 - Fair Value Measurements and Fair Value of Financial Instruments - Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Commercial Portfolio Segment [Member]
Collateral dependent loans	$ 723	$ 726
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans	0	0
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans	0	0
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans	723	726
Commercial Real Estate Portfolio Segment [Member]
Collateral dependent loans	617	2,913
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans	$ 617	$ 2,913

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- Definition

Fair value portion of impaired financing receivable.

+ 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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- Details

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- Details

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- Details

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- Details

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- Details

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