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PARENT CORPORATION ONLY FINANCIAL STATEMENTS (Details) - Condensed Statements of Cash Flows (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |
Net income | $ 18,565,000 us-gaap_NetIncomeLoss | $ 19,925,000 us-gaap_NetIncomeLoss | $ 17,507,000 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
(Increase) decrease in other assets | 2,200,000 us-gaap_IncreaseDecreaseInOtherOperatingAssets | 414,000 us-gaap_IncreaseDecreaseInOtherOperatingAssets | (1,465,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Decrease in other liabilities | 377,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | (1,792,000)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 980,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Stock based compensation | 223,000 us-gaap_ShareBasedCompensation | 59,000 us-gaap_ShareBasedCompensation | 39,000 us-gaap_ShareBasedCompensation
Cash flows from financing activities: |  |  |
Cash dividends on common stock | (6,940,000)us-gaap_PaymentsOfDividendsCommonStock | (4,254,000)us-gaap_PaymentsOfDividendsCommonStock | (2,778,000)us-gaap_PaymentsOfDividendsCommonStock
Cash dividends on preferred stock | (140,000)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | (141,000)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | (363,000)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Proceeds from exercise of stock options | 885,000 us-gaap_ProceedsFromStockOptionsExercised | 21,000 us-gaap_ProceedsFromStockOptionsExercised | 141,000 us-gaap_ProceedsFromStockOptionsExercised
Decrease in cash and cash equivalents | 44,155,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (23,446,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (4,963,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 82,692,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 106,138,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 111,101,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at the end of year | 126,847,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 82,692,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 106,138,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | 18,565,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 19,925,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,507,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Net gains on sales of available for sale securities |  | (22,000)us-gaap_GainLossOnSaleOfEquityInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (26,000)us-gaap_GainLossOnSaleOfEquityInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed earnings of subsidiary | (9,890,000)cnob_EquityInUndistributedIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (15,916,000)cnob_EquityInUndistributedIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (15,709,000)cnob_EquityInUndistributedIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Increase) decrease in other assets | (1,979,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (167,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 563,000 us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Decrease in other liabilities | (1,010,000)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (276,000)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (772,000)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stock based compensation | 223,000 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 59,000 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 39,000 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by operating activities | 5,909,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,603,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,602,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from investing activities: |  |  |
Proceeds from sales of available-for-sale securities |  | 181,000 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 375,000 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchase of available-for-sale securities |  |  | (410,000)cnob_PurchaseOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) investing activities |  | 181,000 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (35,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from financing activities: |  |  |
Cash dividends on common stock | (6,940,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,254,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,778,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash dividends on preferred stock | (140,000)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (141,000)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (363,000)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Issuance of restricted stock award |  | 243,000 us-gaap_ProceedsFromSaleOfRestrictedInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Issuance cost of common stock | (7,000)us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (13,000)us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8,000)us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from exercise of stock options | 885,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 21,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 141,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Tax expense from stock based compensation | 282,000 cnob_TaxExpenseFromStockBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16,000 cnob_TaxExpenseFromStockBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 28,000 cnob_TaxExpenseFromStockBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in financing activities | (5,920,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,128,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,980,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Decrease in cash and cash equivalents | (11,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (344,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,413,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of year | 285,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 629,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,042,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at the end of year | $ 274,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 285,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 629,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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