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Fair Value Measurements and Fair Value of Financial Instruments (Details) - Schedule of Assets at Fair Value on Non-Recurring Basis (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Impaired Loans |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 3,277 | $ 4,229
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] |  |
Impaired Loans |  |
Assets, Fair Value Disclosure, Nonrecurring | 3,277 | 4,229
Residential Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] |  |
Impaired Loans |  |
Assets, Fair Value Disclosure, Nonrecurring | 1,442 | 220
Residential Portfolio Segment [Member] | Other Real Estate Owned [Member] |  |
Impaired Loans |  |
Assets, Fair Value Disclosure, Nonrecurring | 1,442 | 220
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Impaired Loans |  |
Assets, Fair Value Disclosure, Nonrecurring |  | 372
Commercial Portfolio Segment [Member] | Impaired Loans [Member] |  |
Impaired Loans |  |
Assets, Fair Value Disclosure, Nonrecurring |  | $ 372

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

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant