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LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items] |  |  |
Non Accrual Contractual Due | 90 days |  |
Loans Pledged as Collateral | $ 1,000,000,000 us-gaap_LoansPledgedAsCollateral | $ 564,700,000 us-gaap_LoansPledgedAsCollateral |
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received | 4,267,000 us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived | 4,483,000 us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived |
Capital Leases Net Investment In Direct Financing Leases Unearned Interest Income | 538,000 cnob_CapitalLeasesNetInvestmentInDirectFinancingLeasesUnearnedInterestIncome | 733,000 cnob_CapitalLeasesNetInvestmentInDirectFinancingLeasesUnearnedInterestIncome |
Capital Leases, Net Investment in Direct Financing Leases | 3,729,000 us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases | 3,750,000 us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases |
Loans performing under the restructured terms | 1,800,000 cnob_LoansPerformingUnderRestructuredTerms |  |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans |  | 5,700,000 us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans |
Financing Receivable, Collectively Evaluated for Impairment | 2,520,693,000 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment | 942,679,000 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment |
Commitments to Lend Additional Funds | 0 cnob_CommitmentsToLendAdditionalFunds |  |
Financing Receivable, Modifications, Recorded Investment | 2,800,000 us-gaap_FinancingReceivableModificationsRecordedInvestment | 6,600,000 us-gaap_FinancingReceivableModificationsRecordedInvestment |
Loans Modified In Troubled Debt Restructuring On Non Accrual Status | 800,000 cnob_LoansModifiedInTroubledDebtRestructuringOnNonAccrualStatus | 1,000,000 cnob_LoansModifiedInTroubledDebtRestructuringOnNonAccrualStatus |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 333,000 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown | 0 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown |
Financing Receivable, Modifications, Number of Contracts | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 |
Acquired Loans [Member] |  |  |
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items] |  |  |
Financing Receivable, Collectively Evaluated for Impairment | $ 1,200,000,000 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cnob_AcquiredLoansMember | $ 34,000,000 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cnob_AcquiredLoansMember |

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- Definition Capital Leases Net Investment In Direct Financing Leases Unearned Interest Income + References No definition available. + Details
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- Definition Commitments to lend additional funds. + References No definition available. + Details
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- Definition Loans modified in troubled debt restructuring on non-accrual status. + References No definition available. + Details
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- Definition Loans performing under the restructured terms + References No definition available. + Details
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- Definition The net investment in direct financing leases as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 + Details
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- Definition Amount of remaining payments as of the balance sheet date that lessees are obligated to make or can be required to make under direct financing leases, including any guarantee of residual value and executory costs. The amount also includes any guaranteed rental payments by an unrelated third-party provided that are financially capable of making such payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554 + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + 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=35738203&loc=d3e5086-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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