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FHLB and other borrowings (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015
FHLB and other borrowings (Details) [Line Items] |
Number of Federal Home Loan Bank Notes | 3 cnob_NumberofFederalHomeLoanBankNotes
Long-term Line of Credit | $ 809,000,000 us-gaap_LineOfCredit
Line of Credit Facility, Remaining Borrowing Capacity | 315,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Federal Home Loan Bank Note One [Member] |
FHLB and other borrowings (Details) [Line Items] |
Extinguishment of Debt, Amount | 2,500,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = cnob_FederalHomeLoanBankNoteOneMember
Debt Instrument, Maturity Date | Apr. 02, 2018
Federal Home Loan Bank Note Two [Member] |
FHLB and other borrowings (Details) [Line Items] |
Extinguishment of Debt, Amount | 7,500,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = cnob_FederalHomeLoanBankNoteTwoMember
Debt Instrument, Maturity Date | Apr. 02, 2018
Federal Home Loan Bank Note Three [Member] |
FHLB and other borrowings (Details) [Line Items] |
Extinguishment of Debt, Amount | $ 5,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = cnob_FederalHomeLoanBankNoteThreeMember
Debt Instrument, Maturity Date | Jul. 16, 2018

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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 Number of federal home loan bank notes. + References No definition available. + Details
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Namespace Prefix: | cnob_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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