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Subordinated Debentures (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2015 | Sep. 30, 2016
Fixed-to-floating Rate Subordinated Notes [Member] |  |
Subordinated Debentures (Details) [Line Items] |  |
Proceeds from Issuance of Debt | $ 50,000 |
Debt Instrument, Term | 5 years |
Debt Instrument, Maturity Date | Jul. 01, 2025 |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |
Debt Instrument, Description of Variable Rate Basis | three-month LIBOR rate plus 393 basis points |
Debt Issuance Cost | $ 665 |
Subordinated Debt from Trust [Member] |  |
Subordinated Debentures (Details) [Line Items] |  |
Value of subordinated debentures received by Trust |  | $ 5,000
Percentage Rate Added to Libor |  | 2.85%
Floating interest rate on subordinated debentures |  | 3.61%
Proceeds from Issuance of Debt |  | $ 5,200
Debt Instrument, Maturity Date |  | Jan. 23, 2034

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- Definition Debt Issuance Cost. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 Percentage rate added to LIBOR. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Cutstom Element. + References No definition available. + Details
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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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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Details
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Period Type: |