DEPOSITS (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Disclosure Text Block [Abstract]
Time Deposits Maturities, after Next Twelve Months	$ 668.7us-gaap_TimeDepositsNoncurrent	$ 152.0us-gaap_TimeDepositsNoncurrent
Time Deposits 250000 or More	$ 108.0cnob_TimeDeposits250000OrMore	$ 61.9cnob_TimeDeposits250000OrMore

Amount of time deposits maturing after the next fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818

Name:	us-gaap_TimeDepositsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant