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Reconciliation of Statutory Federal Tax Rate and Effective Tax Rate from Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Effective Tax Rates Line Items
Federal statutory tax rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Reduction resulting from:
Tax-exempt interest	(4.35%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome	(5.14%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome	(4.16%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
State income taxes, net of federal benefit	2.66%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.35%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.35%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other, net	(0.72%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.33%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.11%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate	32.59%us-gaap_EffectiveIncomeTaxRateContinuingOperations	31.88%us-gaap_EffectiveIncomeTaxRateContinuingOperations	33.08%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

-Name Accounting Standards Codification

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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