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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 $ 2.4cnob_AmountRecordedAsFraudPretaxLoss  
Subsequent Event [Member]    
Subsequent Event (Details) [Line Items]    
Amount Received as Pretax Recovery   $ 2.2cnob_AmountReceivedAsPretaxRecovery
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember