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Share-Based Compensation Arrangements
9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation Arrangements
Share-Based Compensation Arrangements
Stock Options
During the nine months ended September 30, 2015, the Corporation granted an executive officer 4,000 non-qualified stock options with 5-year cliff vesting. The grant-date fair value of stock options of $11.26 was estimated using the Black-Scholes Option-Pricing Model.

Nonvested Shares
During the nine months ended September 30, 2015, the Corporation granted to non-employee directors and an executive officer 9,500 nonvested share units, with 3- to 5-year cliff vesting. The weighted average grant date fair value of the nonvested share units was $37.80.

Nonvested Performance Shares
During the nine months ended September 30, 2015, performance share awards were granted to certain executive officers providing the opportunity to earn shares of common stock of the Corporation. The performance shares awarded were valued at the fair market value as of the award date, or $38.02, and will be earned over a 3-year performance period. The number of shares earned will range from zero to 200% of the target number of shares dependent upon the Corporation’s core return on equity and core earnings per share growth ranking compared to an industry peer group. The current assumption based on the most recent peer group information available results in shares earned at 150% of the target, or 46,950 shares.