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Subsequent Event (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014
Subsequent Event [Member] |
Subsequent Event (Details) [Line Items] |
Expected Amount Under Investigation After Tax | $ 1.5

X
- Definition Expected amount under investigation after tax. + References No definition available. + Details
Name: | cnob_ExpectedAmountUnderInvestigationAfterTax
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | cnob_SubsequentEventDetailsLineItems
Namespace Prefix: | cnob_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration