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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, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Compensation expense related to stock options	$ 542	$ 212	$ 983	$ 572
Income tax benefit related to stock options	$ 190	$ 74	$ 344	$ 200
Impact on basic earnings per share	0.01	0.01	0.02	0.01
Impact on diluted earnings per share	0.01	0.01	0.02	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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