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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	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to stock options	$ 1,873	$ 1,343	$ 1,301
Income tax benefit related to stock options	$ 656	$ 470	$ 455
Impact on basic earnings per share	$ 0.04	$ 0.03	$ 0.03
Impact on diluted earnings per share	$ 0.04	$ 0.03	$ 0.03

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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