Stock-Based Compensation

3 Months Ended

Mar. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

The fair value of equity awards granted to employees is recognized as compensation expense over the period during which employees are required to provide service in exchange for such awards. The Corporation grants equity awards to employees, consisting of stock options and restricted stock, under its 2004 Stock Option and Compensation Plan (Employee Option Plan). In addition, employees may purchase stock under the Corporation’s Employee Stock Purchase Plan.

The Corporation also grants restricted stock to non-employee members of the board of directors under its 2011 Directors’ Equity Participation Plan (Directors’ Plan). Under the Directors’ Plan, the Corporation can grant equity awards to non-employee holding company and subsidiary bank directors in the form of stock options, restricted stock or common stock.

The following table presents compensation expense and the related tax benefits for equity awards recognized in the consolidated statements of income:

	Three months ended March 31
	2013			2012
	(in thousands)
Stock-based compensation expense	$	847		$	713
Tax benefit	(224		)	(159		)
Stock-based compensation expense, net of tax	$	623		$	554

Stock option fair values are estimated through the use of the Black-Scholes valuation methodology as of the date of grant. Stock options carry terms of up to ten years. Restricted stock fair values are equal to the average trading price of the Corporation’s stock on the date of grant. Restricted stock awards earn dividends during the vesting period, which are forfeitable if the awards do not vest. Stock options and restricted stock under the Employee Option Plan have historically been granted annually and become fully vested over or after a three year vesting period. Restricted stock awards under the Directors' Plan generally vest one year from the date of grant. Certain events, as defined in the Employee Option Plan and the Directors' Plan, result in the acceleration of the vesting of both stock options and restricted stock. As of March 31, 2013, the Employee Option Plan had 11.8 million shares reserved for future grants through 2013. On April 1, 2013, the Corporation granted approximately 618,000 stock options and 342,000 shares of restricted stock under its Employee Option Plan. As of March 31, 2013, the Directors’ Plan had 469,000 shares reserved for future grants through 2021. On May 1, 2013, the Corporation granted approximately 18,000 shares of restricted stock under its Directors’ Plan.