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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net income | $ 18,565 us-gaap_NetIncomeLoss | $ 19,925 us-gaap_NetIncomeLoss | $ 17,507 us-gaap_NetIncomeLoss
Unrealized gains and losses on securities available-for-sale: |  |  |
Unrealized holding gains (losses) on available for sale securities | 6,966 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | (8,741)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | 19,819 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Tax effect | (2,635)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | 3,578 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | (7,444)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Net of tax amount | 4,331 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | (5,163)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 12,375 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Reclassification adjustments for OTTI losses included in income |  | 652 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesBeforeTax | 870 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesBeforeTax
Tax effect |  | (178)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesTax | (265)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesTax
Net of tax amount |  | 474 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax | 605 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax
Reclassification adjustment for realized gains arising during this period | (2,818)cnob_OtherComprehensiveIncomeLossReclassificationAdjustmentForNetGainsBeforeTax | (2,363)cnob_OtherComprehensiveIncomeLossReclassificationAdjustmentForNetGainsBeforeTax | (2,882)cnob_OtherComprehensiveIncomeLossReclassificationAdjustmentForNetGainsBeforeTax
Tax effect | 986 cnob_OtherComprehensiveIncomeLossReclassificationAdjustmentForNetGainsTaxEffect | 645 cnob_OtherComprehensiveIncomeLossReclassificationAdjustmentForNetGainsTaxEffect | 879 cnob_OtherComprehensiveIncomeLossReclassificationAdjustmentForNetGainsTaxEffect
Net of tax amount | (1,832)cnob_OtherComprehensiveIncomeLossReclassificationAdjustmentForNetGainsNetOfTax | (1,718)cnob_OtherComprehensiveIncomeLossReclassificationAdjustmentForNetGainsNetOfTax | (2,003)cnob_OtherComprehensiveIncomeLossReclassificationAdjustmentForNetGainsNetOfTax
Unrealized holding losses on securities transferred from available-for-sale to held-to-maturity securities |  | (2,612)cnob_OtherComprehensiveIncomeLossTransfersFromAvailableForSaleSecuritiesToHeldToMaturityBeforeTax |
Tax effect |  | 1,064 cnob_OtherComprehensiveIncomeLossTransfersFromAvailableForSaleSecuritiesToHeldToMaturityTax |
Net of tax amount |  | (1,548)cnob_OtherComprehensiveIncomeLossTransfersFromAvailableForSaleSecuritiesToHeldToMaturityNetOfTax |
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity securities | 215 cnob_AmortizationOfUnrealizedHoldingGainsOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturitySecuritiesBeforeTax | (58)cnob_AmortizationOfUnrealizedHoldingGainsOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturitySecuritiesBeforeTax | (2)cnob_AmortizationOfUnrealizedHoldingGainsOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturitySecuritiesBeforeTax
Tax effect | (91)cnob_AmortizationOfUnrealizedHoldingGainsOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturitySecuritiesTax | 19 cnob_AmortizationOfUnrealizedHoldingGainsOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturitySecuritiesTax | 1 cnob_AmortizationOfUnrealizedHoldingGainsOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturitySecuritiesTax
Net of tax amount | 124 cnob_AmortizationOfUnrealizedHoldingGainsOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturitySecuritiesNetOfTax | (39)cnob_AmortizationOfUnrealizedHoldingGainsOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturitySecuritiesNetOfTax | (1)cnob_AmortizationOfUnrealizedHoldingGainsOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturitySecuritiesNetOfTax
Unrealized holding gain on cash flow hedge | 48 cnob_UnrealizedHoldingGainOnCashFlowHedgeBeforeTax |  |
Tax effect | (20)cnob_UnrealizedHoldingGainOnCashFlowHedgeTax |  |
Net of tax amount | 28 cnob_UnrealizedHoldingGainOnCashFlowHedgeNetOfTax |  |
Pension plan: |  |  |
Actuarial gains (losses) | (1,896)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent | 654 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent | (790)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent
Tax effect | 775 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | (267)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | 323 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Net of tax amount | (1,121)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent | 387 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent | (467)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Total other comprehensive income (loss) | 1,530 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (7,607)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 10,509 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income | $ 20,095 us-gaap_ComprehensiveIncomeNetOfTax | $ 12,318 us-gaap_ComprehensiveIncomeNetOfTax | $ 28,016 us-gaap_ComprehensiveIncomeNetOfTax

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