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Share-Based Compensation - Compensation Expense Included in Salaries and Employee Benefits Expense and Related Income Tax Benefits (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Compensation expense related to stock options	$ 533	$ 442
Income tax benefit related to stock options	$ 187	$ 155
Impact on basic earnings per share	$ 0.01	$ 0.01
Impact on diluted earnings per share	$ 0.01	$ 0.01

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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