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Reconciliation of Statutory Federal Tax Rate and Effective Tax Rate from Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Effective Tax Rates Line Items
Tax at statutory rate	35.00%	35.00%	35.00%
(Reduction) increase resulting from:
Tax-exempt interest income	(4.16%)	(6.40%)	(6.79%)
State income taxes, net of federal benefit	2.35%	2.78%	2.32%
Other, net	(0.11%)	0.96%	(4.18%)
Effective tax rate	33.08%	32.34%	26.35%

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to income that is exempt from income taxes under enacted tax laws.

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