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Components of Income Tax Expense (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 tax expense:                      
Federal                 $ 7,234us-gaap_CurrentFederalTaxExpenseBenefit $ 12,819us-gaap_CurrentFederalTaxExpenseBenefit $ 13,733us-gaap_CurrentFederalTaxExpenseBenefit
State                 1,325us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,743us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,291us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current tax expense                 8,559us-gaap_CurrentIncomeTaxExpenseBenefit 14,562us-gaap_CurrentIncomeTaxExpenseBenefit 15,024us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense (benefit):                      
Federal                 2,971us-gaap_DeferredFederalIncomeTaxExpenseBenefit (3,136)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (1,501)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State                 794us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (518)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 605us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred tax expense (benefit)                 3,765us-gaap_DeferredIncomeTaxExpenseBenefit (3,654)us-gaap_DeferredIncomeTaxExpenseBenefit (896)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense $ 2,931us-gaap_IncomeTaxExpenseBenefit $ 3,609us-gaap_IncomeTaxExpenseBenefit $ 3,223us-gaap_IncomeTaxExpenseBenefit $ 2,561us-gaap_IncomeTaxExpenseBenefit $ 2,436us-gaap_IncomeTaxExpenseBenefit $ 2,539us-gaap_IncomeTaxExpenseBenefit $ 2,537us-gaap_IncomeTaxExpenseBenefit $ 3,396us-gaap_IncomeTaxExpenseBenefit $ 12,324us-gaap_IncomeTaxExpenseBenefit $ 10,908us-gaap_IncomeTaxExpenseBenefit $ 14,128us-gaap_IncomeTaxExpenseBenefit