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Reconciliation of Statutory Federal Tax Rate and Effective Tax Rate from Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Effective Tax Rates [Line Items]
Federal statutory tax rate	35.00%	35.00%	35.00%
(Reduction) increase resulting from:
Tax-exempt interest	(4.07%)	(4.35%)	(5.14%)
State income taxes, net of federal benefit	1.78%	2.66%	2.35%
Bank owned life insurance	(1.92%)	(1.47%)	(1.48%)
Other, net	0.89%	0.75%	1.15%
Effective tax rate	31.68%	32.59%	31.88%

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Schedule Of Effective Tax Rates [Line Items]

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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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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to life insurance expense.

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