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Fair Value Measurements and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Fair Value Disclosures [Abstract] |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | $ 96,117 | $ 6,000
Impaired Financing Receivable, Related Allowance | $ 900 | $ 2,200

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- Definition Amount of allowance for credit losses related to recorded investment. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524 + Details
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Balance Type: | debit
Period Type: | instant