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Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Components of Deferred Tax Assets and Liabilities [Abstract]    
Allowance for loan losses $ 8,037us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses $ 10,364us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Net operating loss 137,412us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 135,050us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Compensation and benefit plans 1,277us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 995us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Fair value basis on securities 656cob_DeferredTaxAssetsFairValueBasisOnSecurities 919cob_DeferredTaxAssetsFairValueBasisOnSecurities
Pension and other post-retirement benefits 1,470us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 1,080us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Other real estate owned 2,256cob_DeferredTaxAssetsRepossessedAssets 4,090cob_DeferredTaxAssetsRepossessedAssets
Gross unrealized securities losses 2,560us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross 10,215us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Interest on non-performing loans 0cob_DeferredTaxAssetsInterestOnNonPerformingLoans 1,339cob_DeferredTaxAssetsInterestOnNonPerformingLoans
Other 851us-gaap_DeferredTaxAssetsOther 529us-gaap_DeferredTaxAssetsOther
Subtotal deferred tax assets 154,519us-gaap_DeferredTaxAssetsGross 164,581us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance (1,300)us-gaap_DeferredTaxAssetsValuationAllowance (148,043)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 153,219us-gaap_DeferredTaxAssetsNet 16,538us-gaap_DeferredTaxAssetsNet
Core deposit intangible 1,513us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 2,051us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Depreciable basis of premises and equipment 563us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 495us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Net deferred loan fees and costs 1,306us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts 1,077us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts
Gross unrealized securities gains 490us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities 1,249us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
Fair value basis of loans 2,473cob_DeferredTaxLiabilitiesFairValueBasisofLoans 951cob_DeferredTaxLiabilitiesFairValueBasisofLoans
Other 441us-gaap_DeferredTaxLiabilitiesOther 500us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 6,786us-gaap_DeferredIncomeTaxLiabilities 6,323us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets $ 146,433us-gaap_DeferredTaxAssetsLiabilitiesNet $ 10,215us-gaap_DeferredTaxAssetsLiabilitiesNet