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Investment Securities (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |  |
Number of Investment Securities Sold | 39 cnob_NumberOfInvestmentSecuritiesSold | 54 cnob_NumberOfInvestmentSecuritiesSold
Available-for-sale Securities Pledged as Collateral | $ 215.9 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral | $ 224.7 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Description of Holding Securities | there were no holdings of securities of any one issuer, other than the U.S Government and its agencies, in an amount greater than 10% of stockholders’ equity. |

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- Definition Description of holding securities. + 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 Number of investment securities sold. + References No definition available. + Details
Name: | cnob_NumberOfInvestmentSecuritiesSold
Namespace Prefix: | cnob_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5086-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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