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Reconciliation of Statutory Federal Tax Rate and Effective Tax Rate from Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Effective Tax Rates Line Items
Federal statutory tax rate	35.00%	35.00%	35.00%
(Reduction) increase resulting from:
Tax-exempt interest	(5.14%)	(4.16%)	(6.40%)
State income taxes, net of federal benefit	2.35%	2.35%	2.78%
Other, net	(0.33%)	(0.11%)	0.96%
Effective tax rate	31.88%	33.08%	32.34%

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

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