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SUBORDINATED DEBENTURES (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Subordinated Borrowings [Abstract] |
Value of subordinated debentures received by Trust | $ 5.2 cnob_ValueOfSubordinatedDebenturesReceived
Floating interest rate on subordinated debentures | 3.08%cnob_FloatingInterestRateOnSubordinatedDebentures

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- Definition Floating interest rate on subordinated debentures. + References No definition available. + Details
Name: | cnob_FloatingInterestRateOnSubordinatedDebentures
Namespace Prefix: | cnob_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Value of subordinated debentures received by Trust. + References No definition available. + Details
Name: | cnob_ValueOfSubordinatedDebenturesReceived
Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_SubordinatedBorrowingsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration