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Income Taxes (Reconciliation of Income Tax Expense) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
Federal statutory tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Amount of tax computed using Federal statutory tax rate of 35% in all years $ 2,788us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (55)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (14,365)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Non-taxable income (54)us-gaap_IncomeTaxReconciliationTaxExemptIncome (88)us-gaap_IncomeTaxReconciliationTaxExemptIncome (169)us-gaap_IncomeTaxReconciliationTaxExemptIncome
State income taxes, net of federal benefit 349us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 9,508us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (1,769)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Valuation allowance on deferred tax assets (146,743)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (34,578)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 15,392us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Bank-owned life insurance (403)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance (375)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance
Reduction of deferred tax assets at Granite 0cob_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssets 28,293cob_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssets 0cob_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssets
Other 1,571us-gaap_IncomeTaxReconciliationOtherReconcilingItems (1,379)us-gaap_IncomeTaxReconciliationOtherReconcilingItems (128)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Total income tax (benefit) expense - continuing operations $ (142,492)us-gaap_IncomeTaxExpenseBenefit $ 1,326us-gaap_IncomeTaxExpenseBenefit $ (1,039)us-gaap_IncomeTaxExpenseBenefit