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Loans and the Allowance for Loan Losses (Details) - Loans held-for-sale - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items] |  |
Total carrying amount |  | $ 24,845
Commercial Real Estate Portfolio Segment [Member] |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items] |  |
Total carrying amount |  | 24,475
Increase in valuation allowance [Member] |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items] |  |
Total carrying amount |  | $ 370

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- Definition Cutstom Element. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The face amount of loans that will be sold to other entities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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