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Income Taxes - Provision for Federal and State Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:                      
Federal                 $ 2,509us-gaap_CurrentFederalTaxExpenseBenefit $ 4,172us-gaap_CurrentFederalTaxExpenseBenefit $ 2,753us-gaap_CurrentFederalTaxExpenseBenefit
State                 777us-gaap_CurrentStateAndLocalTaxExpenseBenefit 591us-gaap_CurrentStateAndLocalTaxExpenseBenefit 258us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred:                      
Federal                 4,027us-gaap_DeferredFederalIncomeTaxExpenseBenefit 922us-gaap_DeferredFederalIncomeTaxExpenseBenefit 2,397us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State                 135us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 11us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 143us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Provision for federal and state income taxes, total $ 1,632us-gaap_IncomeTaxExpenseBenefit $ 2,264us-gaap_IncomeTaxExpenseBenefit $ 1,547us-gaap_IncomeTaxExpenseBenefit $ 2,005us-gaap_IncomeTaxExpenseBenefit $ 1,049us-gaap_IncomeTaxExpenseBenefit $ 1,400us-gaap_IncomeTaxExpenseBenefit $ 1,537us-gaap_IncomeTaxExpenseBenefit $ 1,710us-gaap_IncomeTaxExpenseBenefit $ 7,448us-gaap_IncomeTaxExpenseBenefit $ 5,696us-gaap_IncomeTaxExpenseBenefit $ 5,551us-gaap_IncomeTaxExpenseBenefit