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Income Taxes (Reconcilements Between Statutory Federal Income Tax Rate And Effective Tax Rate) (Detail) (USD $)
 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
Income Tax Disclosure [Abstract]                      
Income tax expense at federal statutory rate                 $ 19,523,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 23,445,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 19,110,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from:                      
Tax exempt income, net                 (3,468,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther (3,185,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther (2,927,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Bank-owned life insurance                 (855,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance (875,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance (916,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance
State income taxes, net of federal income tax benefits                 2,182,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 2,879,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 2,424,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, net                 200,000us-gaap_IncomeTaxReconciliationOtherAdjustments 299,000us-gaap_IncomeTaxReconciliationOtherAdjustments 354,000us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense (benefit) and rate $ 4,086,000us-gaap_IncomeTaxExpenseBenefit $ 5,428,000us-gaap_IncomeTaxExpenseBenefit $ 2,722,000us-gaap_IncomeTaxExpenseBenefit $ 5,346,000us-gaap_IncomeTaxExpenseBenefit $ 4,505,000us-gaap_IncomeTaxExpenseBenefit $ 6,419,000us-gaap_IncomeTaxExpenseBenefit $ 6,353,000us-gaap_IncomeTaxExpenseBenefit $ 5,286,000us-gaap_IncomeTaxExpenseBenefit $ 17,582,000us-gaap_IncomeTaxExpenseBenefit $ 22,563,000us-gaap_IncomeTaxExpenseBenefit $ 18,045,000us-gaap_IncomeTaxExpenseBenefit
Income tax expense at federal statutory rate                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from:                      
Tax exempt income, net                 (6.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (4.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (5.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Bank-owned life insurance                 (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance (1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance
State income taxes, net of federal income tax benefits                 3.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other, net                 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total income tax expense (benefit) and rate                 31.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 33.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 33.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations