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Loans and the Allowance for Loan Losses (Details) - Schedule of accretable yield, or income expected to be collected - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of accretable yield, or income expected to be collected [Abstract]
Balance at beginning of period	$ 1,134	$ 1,387
New loans purchased	1,286
Accretion of income	(146)	(65)
Balance at end of period	$ 2,274	$ 1,322

X

- Definition

Loans and leases receivable purchased loans.

+ References

No definition available.

+ Details

Name:	cnob_LoansAndLeasesReceivablePurchasedLoans
Namespace Prefix:	cnob_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Loans and leases receivable purchased loans accretion of income.

+ References

No definition available.

+ Details

Name:	cnob_LoansAndLeasesReceivablePurchasedLoansAccretionOfIncome
Namespace Prefix:	cnob_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	cnob_ScheduleOfAccretableYieldOrIncomeExpectedToBeCollectedAbstract
Namespace Prefix:	cnob_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration