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Income Taxes - Summary of Reconciliation of Statutory Federal Tax and Effective Income Tax Rates (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of Effective Income Tax Rates Continuing Operations      
Federal income tax expense (2) $ 21,121us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 19,205us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 16,745us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 2,946us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 3,105us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 2,571us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
ESOP dividend deduction (267)us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends (256)us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends (235)us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends
Other 145us-gaap_IncomeTaxReconciliationOtherReconcilingItems 31us-gaap_IncomeTaxReconciliationOtherReconcilingItems 215us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Total Income Tax Expense $ 23,945us-gaap_IncomeTaxExpenseBenefit $ 22,085us-gaap_IncomeTaxExpenseBenefit $ 19,296us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate 39.88%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.25%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.07%us-gaap_EffectiveIncomeTaxRateContinuingOperations