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v2.4.1.9

Loans and the Allowance for Loan and Lease Losses (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Loans and the Allowance for Loan and Lease Losses (Details) [Line Items] |  |  |
Number of Segments of Loans and Leases | 5 cnob_NumberOfSegmentsOfLoansAndLeases |  |
Non Accrual Contractual Due | 90 years |  |
Threshold to Determine Impaired Loans | $ 250,000 cnob_ThresholdtoDetermineImpairedLoans |  |
Period Considered to Calculate Actual Loss | 3 years |  |
Loans Pledged as Collateral | 1,100,000,000 us-gaap_LoansPledgedAsCollateral |  | 1,000,000,000 us-gaap_LoansPledgedAsCollateral
Financing Receivable, Collectively Evaluated for Impairment | 2,616,330,000 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment |  | 2,520,693,000 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Commitments to Lend Additional Funds | 0 cnob_CommitmentsToLendAdditionalFunds |  |
Financing Receivable, Modifications, Recorded Investment | 2,800,000 us-gaap_FinancingReceivableModificationsRecordedInvestment |  | 2,800,000 us-gaap_FinancingReceivableModificationsRecordedInvestment
Loans Modified In Troubled Debt Restructuring On Non Accrual Status | 1,100,000 cnob_LoansModifiedInTroubledDebtRestructuringOnNonAccrualStatus |  | 1,000,000 cnob_LoansModifiedInTroubledDebtRestructuringOnNonAccrualStatus
Financing Receivable, Modifications, Number of Contracts | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 0 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown | 333,000 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 |  |
Acquired Loans [Member] |  |  |
Loans and the Allowance for Loan and Lease Losses (Details) [Line Items] |  |  |
Financing Receivable, Collectively Evaluated for Impairment | $ 1,100,000,000 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cnob_AcquiredLoansMember |  | $ 1,200,000,000 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cnob_AcquiredLoansMember

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- Definition Commitments to lend additional funds. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Loans modified in troubled debt restructuring on non-accrual status. + 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 Non accrual contractual due. + References No definition available. + Details
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Namespace Prefix: | cnob_
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Balance Type: | na
Period Type: | duration

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- Definition Number of segments of loans and leases. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Period considered to calculate actual loss. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Threshold to determine impaired loans. + 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 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=49124121&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

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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=49124121&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=49124121&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 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=49124121&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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- Details
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