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Income Taxes - Components of Income Tax Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Current year provision:    
Federal $ (15)us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
State 4us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current income tax expense (benefit) (11)us-gaap_CurrentIncomeTaxExpenseBenefit 0us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense    
Federal 720us-gaap_DeferredFederalIncomeTaxExpenseBenefit 253us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 6us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 2us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred tax expense (benefit) 726us-gaap_DeferredIncomeTaxExpenseBenefit 255us-gaap_DeferredIncomeTaxExpenseBenefit
Change in valuation allowance on deferred taxes 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (255)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Net federal income tax expense (benefit) $ 715us-gaap_IncomeTaxExpenseBenefit $ 0us-gaap_IncomeTaxExpenseBenefit