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Note 15 - Stockholders' Equity and Regulatory Requirements (Details Textual)	Dec. 31, 2024
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets, Percentage	3.61%
Total Risk Based Capital Ratio	3.10%

X

- Definition

Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	cnob_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Total risk based capital ratio.

+ References

No definition available.

+ Details

Name:	cnob_TotalRiskBasedCapitalRatio
Namespace Prefix:	cnob_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant