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v2.4.1.9

Subsequent Event (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Apr. 27, 2015
Subsequent Event (Details) [Line Items] |  |
Amount Recorded as Fraud Pretax Loss | $ 2.4 cnob_AmountRecordedAsFraudPretaxLoss |
Subsequent Event [Member] |  |
Subsequent Event (Details) [Line Items] |  |
Amount Received as Pretax Recovery |  | $ 2.2 cnob_AmountReceivedAsPretaxRecovery / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Definition Amount received as pretax recovery. + References No definition available. + Details
Name: | cnob_AmountReceivedAsPretaxRecovery
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount recorded as fraud pretax loss. + References No definition available. + Details
Name: | cnob_AmountRecordedAsFraudPretaxLoss
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

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |