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PARENT CORPORATION ONLY FINANCIAL STATEMENTS (Details) - Condensed Statements of Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Condensed Income Statements, Captions [Line Items]                      
Dividend income from subsidiaries                 $ 636us-gaap_DividendIncomeOperating $ 523us-gaap_DividendIncomeOperating $ 567us-gaap_DividendIncomeOperating
Net Income 8,023us-gaap_NetIncomeLoss 1,766us-gaap_NetIncomeLoss 4,378us-gaap_NetIncomeLoss 4,398us-gaap_NetIncomeLoss 4,984us-gaap_NetIncomeLoss 5,094us-gaap_NetIncomeLoss 4,923us-gaap_NetIncomeLoss 4,924us-gaap_NetIncomeLoss 18,565us-gaap_NetIncomeLoss 19,925us-gaap_NetIncomeLoss 17,507us-gaap_NetIncomeLoss
Parent Company [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Dividend income from subsidiaries                 9,276us-gaap_DividendIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,393us-gaap_DividendIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,079us-gaap_DividendIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other income                 6us-gaap_OtherIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
6us-gaap_OtherIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
15us-gaap_OtherIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net gains on available for sale securities                   22us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
26us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Management fees                 100us-gaap_ManagementFeesRevenue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
353us-gaap_ManagementFeesRevenue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
409us-gaap_ManagementFeesRevenue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total Income                 9,382us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,774us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,529us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Expenses                 (707)us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(765)us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(731)us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income before equity in undistributed earnings of subsidiaries                 8,675cnob_IncomeLossBeforeUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,009cnob_IncomeLossBeforeUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,798cnob_IncomeLossBeforeUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Equity in undistributed earnings of subsidiaries                 9,890cnob_EquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
15,916cnob_EquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
15,709cnob_EquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net Income                 $ 18,565us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 19,925us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 17,507us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember