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Share-Based Compensation Arrangements	3 Months Ended
Share-Based Compensation Arrangements	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation Arrangements	Share-Based Compensation Arrangements During the three months ended March 31, 2016, the Corporation granted equity awards, which included performance share awards. The performance share awards were granted to certain executive officers providing the opportunity to earn shares of common stock of the Corporation. These awards were valued at fair market value as of January 20, 2016 (the award date), or $36.11, 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 54,450 shares.