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FHLB Borrowings (Details) $ in Millions	Sep. 30, 2021 USD ($)
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures [Abstract]
Value of commercial loans used as collateral for FHLB advances	$ 2,000
Remaining borrowing capacity	1,200
FHLB advances hedged with interest rate swaps	$ 75

X

- Definition

FHLB advances hedged with interest rate swaps.

+ References

No definition available.

+ Details

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Namespace Prefix:	cnob_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Value of commercial loans used as collateral for FHLB advances.

+ References

No definition available.

+ Details

Name:	cnob_FederalHomeLoanBankAdvancesValueOfCollateral
Namespace Prefix:	cnob_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant