XML 107 R91.htm IDEA: XBRL DOCUMENT v2.4.1.9
BORROWED FUNDS (Details) - Schedule of components of borrowings (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Outstanding $ 494,525,000us-gaap_DebtInstrumentCarryingAmount  
Add Fair Value Mark: 1,028,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet  
495,553,000us-gaap_LongTermDebt 146,000,000us-gaap_LongTermDebt
Federal Home Loan Bank Zero Point Three Five [Member]    
Debt Instrument [Line Items]    
Maturity Date Jan. 15, 2015  
Interest Rate 0.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointThreeFiveMember
 
Outstanding 25,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointThreeFiveMember
 
Federal Home Loan Bank Zero Point Eight Eight [Member]    
Debt Instrument [Line Items]    
Maturity Date Feb. 23, 2015  
Interest Rate 0.88%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointEightEightMember
 
Outstanding 10,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointEightEightMember
 
Federal Home Loan Bank Zero Zero Point Three Five [Member]    
Debt Instrument [Line Items]    
Maturity Date Mar. 02, 2015  
Interest Rate 0.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroZeroPointThreeFiveMember
 
Outstanding 25,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroZeroPointThreeFiveMember
 
Federal Home Loan Bank Zero Point Three Eight [Member]    
Debt Instrument [Line Items]    
Maturity Date Mar. 30, 2015  
Interest Rate 0.38%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointThreeEightMember
 
Outstanding 25,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointThreeEightMember
 
Federal Home Loan Bank Zero Point Three Seven [Member]    
Debt Instrument [Line Items]    
Maturity Date Mar. 31, 2015  
Interest Rate 0.37%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointThreeSevenMember
 
Outstanding 25,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointThreeSevenMember
 
Federal Home Loan Bank Zero Point Three Nine [Member]    
Debt Instrument [Line Items]    
Maturity Date May 01, 2015  
Interest Rate 0.39%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointThreeNineMember
 
Outstanding 25,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointThreeNineMember
 
Federal Home Loan Bank Zero Point Eight One [Member]    
Debt Instrument [Line Items]    
Maturity Date May 07, 2015  
Interest Rate 0.81%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointEightOneMember
 
Outstanding 15,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointEightOneMember
 
Federal Home Loan Bank Two Point One Seven [Member]    
Debt Instrument [Line Items]    
Maturity Date May 11, 2015  
Interest Rate 2.17%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointOneSevenMember
 
Outstanding 525,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointOneSevenMember
 
Federal Home Loan Bank Two Point Nine One [Member]    
Debt Instrument [Line Items]    
Maturity Date May 11, 2015  
Interest Rate 2.91%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointNineOneMember
 
Outstanding 5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointNineOneMember
 
Federal Home Loan Bank Zero Point Four One [Member]    
Debt Instrument [Line Items]    
Maturity Date Jun. 01, 2015  
Interest Rate 0.41%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointFourOneMember
 
Outstanding 25,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointFourOneMember
 
Federal Home Loan Bank Zero Point Four Six [Member]    
Debt Instrument [Line Items]    
Maturity Date Jun. 01, 2015  
Interest Rate 0.46%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointFourSixMember
 
Outstanding 25,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointFourSixMember
 
Federal Home Loan Bank Zero Point Four Four [Member]    
Debt Instrument [Line Items]    
Maturity Date Jun. 09, 2015  
Interest Rate 0.44%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointFourFourMember
 
Outstanding 25,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointFourFourMember
 
Federal Home Loan Bank Zero Point Four Eight [Member]    
Debt Instrument [Line Items]    
Maturity Date Jun. 26, 2015  
Interest Rate 0.48%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointFourEightMember
 
Outstanding 25,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankZeroPointFourEightMember
 
Federal Home Loan Bank One Point Four Nine [Member]    
Debt Instrument [Line Items]    
Maturity Date Aug. 05, 2015  
Interest Rate 1.49%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointFourNineMember
 
Outstanding 2,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointFourNineMember
 
Federal Home Loan Bank One Point Nine Three [Member]    
Debt Instrument [Line Items]    
Maturity Date Aug. 03, 2016  
Interest Rate 1.93%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointNineThreeMember
 
Outstanding 10,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointNineThreeMember
 
Federal Home Loan Bank One Point Zero Four [Member]    
Debt Instrument [Line Items]    
Maturity Date Aug. 26, 2016  
Interest Rate 1.04%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointZeroFourMember
 
Outstanding 5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointZeroFourMember
 
Federal Home Loan Bank One Point One Five [Member]    
Debt Instrument [Line Items]    
Maturity Date Oct. 11, 2016  
Interest Rate 1.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointOneFiveMember
 
Outstanding 5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointOneFiveMember
 
Federal Home Loan Bank One Point One Six [Member]    
Debt Instrument [Line Items]    
Maturity Date Jan. 23, 2017  
Interest Rate 1.16%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointOneSixMember
 
Outstanding 10,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointOneSixMember
 
Federal Home Loan Bank One Point Two Six [Member]    
Debt Instrument [Line Items]    
Maturity Date Apr. 28, 2017  
Interest Rate 1.26%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointTwoSixMember
 
Outstanding 5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointTwoSixMember
 
Repo Five Point Nine Five [Member]    
Debt Instrument [Line Items]    
Maturity Date Jun. 15, 2017 Jun. 15, 2017
Interest Rate 5.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_RepoFivePointNineFiveMember
5.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_RepoFivePointNineFiveMember
Outstanding 15,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_RepoFivePointNineFiveMember
15,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_RepoFivePointNineFiveMember
Federal Home Loan Bank One Point Three [Member]    
Debt Instrument [Line Items]    
Maturity Date Jun. 26, 2017  
Interest Rate 1.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointThreeZeroMember
 
Outstanding 25,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointThreeZeroMember
 
Federal Home Loan Bank One Point Two Nine [Member]    
Debt Instrument [Line Items]    
Maturity Date Jul. 08, 2017  
Interest Rate 1.29%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointTwoNineMember
 
Outstanding 5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointTwoNineMember
 
Federal Home Loan Bank One Point Four One [Member]    
Debt Instrument [Line Items]    
Maturity Date Sep. 25, 2017  
Interest Rate 1.41%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointFourOneMember
 
Outstanding 11,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointFourOneMember
 
Federal Home Loan Bank One Point Five Six [Member]    
Debt Instrument [Line Items]    
Maturity Date Feb. 12, 2018  
Interest Rate 1.56%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointFiveSixMember
 
Outstanding 10,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointFiveSixMember
 
Federal Home Loan Bank Two Point Five [Member]    
Debt Instrument [Line Items]    
Maturity Date Apr. 02, 2018  
Interest Rate 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointFiveMember
 
Outstanding 2,500,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointFiveMember
 
Federal Home Loan Bank One Point Nine Eight [Member]    
Debt Instrument [Line Items]    
Maturity Date Apr. 02, 2018  
Interest Rate 1.98%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointNineEightMember
 
Outstanding 7,500,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointNineEightMember
 
Federal Home Loan Bank One Point Seven Five [Member]    
Debt Instrument [Line Items]    
Maturity Date Apr. 30, 2018  
Interest Rate 1.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointSevenFiveMember
 
Outstanding 5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointSevenFiveMember
 
Federal Home Loan Bank Two Point Nine Nine [Member]    
Debt Instrument [Line Items]    
Maturity Date Jul. 16, 2018 Jan. 03, 2018
Interest Rate 2.99%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointNineNineMember
2.99%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointNineNineMember
Outstanding 5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointNineNineMember
3,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointNineNineMember
Repo Five Point Eight Five [Member]    
Debt Instrument [Line Items]    
Maturity Date Aug. 08, 2018 Aug. 08, 2018
Interest Rate 5.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_RepoFivePointEightFiveMember
5.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_RepoFivePointEightFiveMember
Outstanding 16,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_RepoFivePointEightFiveMember
16,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_RepoFivePointEightFiveMember
Federal Home Loan Bank Four Point One Five [Member]    
Debt Instrument [Line Items]    
Maturity Date Sep. 11, 2018  
Interest Rate 4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankFourPointOneFiveMember
 
Outstanding 5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankFourPointOneFiveMember
 
Federal Home Loan Bank One Point Six Eight [Member]    
Debt Instrument [Line Items]    
Maturity Date Oct. 23, 2018  
Interest Rate 1.68%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointSixEightMember
 
Outstanding 10,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointSixEightMember
 
Federal Home Loan Bank One One Point Six Eight [Member]    
Debt Instrument [Line Items]    
Maturity Date Nov. 19, 2018  
Interest Rate 1.68%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOneOnePointSixEightMember
 
Outstanding 10,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOneOnePointSixEightMember
 
Federal Home Loan Bank One Point Seven Eight [Member]    
Debt Instrument [Line Items]    
Maturity Date Dec. 17, 2018  
Interest Rate 1.78%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointSevenEightMember
 
Outstanding 25,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointSevenEightMember
 
Federal Home Loan Bank One Point Seven Nine [Member]    
Debt Instrument [Line Items]    
Maturity Date Jan. 30, 2019  
Interest Rate 1.79%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointSevenNineMember
 
Outstanding 4,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointSevenNineMember
 
Federal Home Loan Bank One Point Nine Nine [Member]    
Debt Instrument [Line Items]    
Maturity Date Feb. 11, 2019  
Interest Rate 1.99%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointNineNineMember
 
Outstanding 6,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankOnePointNineNineMember
 
Federal Home Loan Bank Three Point Two Three [Member]    
Debt Instrument [Line Items]    
Maturity Date Oct. 30, 2020  
Interest Rate 3.23%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointTwoThreeMember
 
Outstanding 20,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointTwoThreeMember
 
Federal Home Loan Bank Three Point Six One [Member]    
Debt Instrument [Line Items]    
Maturity Date Nov. 02, 2020  
Interest Rate 3.61%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointSixOneMember
 
Outstanding 20,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointSixOneMember
 
Federal Home Loan Bank Three Point One Eight [Member]    
Debt Instrument [Line Items]    
Maturity Date   Nov. 16, 2017
Interest Rate   3.18%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomLoanBankThreePointOneEightMember
Outstanding   5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomLoanBankThreePointOneEightMember
Federal Home Loan Bank Three Point Two Nine [Member]    
Debt Instrument [Line Items]    
Maturity Date   Nov. 16, 2017
Interest Rate   3.29%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointTwoNineMember
Outstanding   5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointTwoNineMember
Federal Home Loan Bank Three Point One [Member]    
Debt Instrument [Line Items]    
Maturity Date   Nov. 16, 2017
Interest Rate   3.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointOneMember
Outstanding   5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointOneMember
Federal Home Loan Bank Three Point Four Nine [Member]    
Debt Instrument [Line Items]    
Maturity Date   Nov. 16, 2017
Interest Rate   3.49%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointFourNineMember
Outstanding   10,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointFourNineMember
Federal Home Loan Bank Three Point One Six [Member]    
Debt Instrument [Line Items]    
Maturity Date   Nov. 27, 2017
Interest Rate   3.16%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointOneSixMember
Outstanding   5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointOneSixMember
Federal Home Loan Bank Three Point Four [Member]    
Debt Instrument [Line Items]    
Maturity Date   Nov. 27, 2017
Interest Rate   3.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointFourMember
Outstanding   5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointFourMember
Federal Home Loan Bank Three Point Two Five [Member]    
Debt Instrument [Line Items]    
Maturity Date   Jan. 03, 2018
Interest Rate   3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointTwoFiveMember
Outstanding   4,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointTwoFiveMember
Federal Home Loan Bank Two Point Seven Four [Member]    
Debt Instrument [Line Items]    
Maturity Date   Jan. 03, 2018
Interest Rate   2.74%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointSevenFourMember
Outstanding   3,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointSevenFourMember
Federal Home Loan Bank Three Point Three Four [Member]    
Debt Instrument [Line Items]    
Maturity Date   Jan. 31, 2018
Interest Rate   3.34%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointThreeFourMember
Outstanding   10,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointThreeFourMember
Federal Home Loan Bank Two Point Four Four [Member]    
Debt Instrument [Line Items]    
Maturity Date   Jan. 31, 2018
Interest Rate   2.44%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointFourFourMember
Outstanding   10,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointFourFourMember
Federal Home Loan Bank Two Point Seven Eight [Member]    
Debt Instrument [Line Items]    
Maturity Date   Jan. 31, 2018
Interest Rate   2.78%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointSevenEightMember
Outstanding   5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankTwoPointSevenEightMember
Federal Home Loan Bank Four Point One Six [Member]    
Debt Instrument [Line Items]    
Maturity Date   Sep. 12, 2018
Interest Rate   4.16%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankFourPointOneSixMember
Outstanding   5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankFourPointOneSixMember
Federal Home Loan Bank Three Point Six Two [Member]    
Debt Instrument [Line Items]    
Maturity Date   Nov. 02, 2020
Interest Rate   3.62%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointSixTwoMember
Outstanding   20,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointSixTwoMember
Federal Home Loan Bank Three Point Two Four [Member]    
Debt Instrument [Line Items]    
Maturity Date   Nov. 30, 2020
Interest Rate   3.24%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointTwoFourMember
Outstanding   $ 20,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= cnob_FederalHomeLoanBankThreePointTwoFourMember