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Share-Based Compensation Arrangements	9 Months Ended
Share-Based Compensation Arrangements	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation Arrangements	Share-Based Compensation Arrangements During the nine months ended September 30, 2018, the Corporation granted equity awards, which included performance share awards and nonvested share unit awards. The performance share awards granted to certain executive officers provide them with the opportunity to earn shares of common stock of the Corporation. The performance share awards were valued at fair market value as of January 18, 2018 (the award date), or $54.25, and will be earned over 3- to 5-year performance periods. 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 140% of the target, or 41,454 shares. The Corporation granted to non-employee directors and a non-executive officer 6,830 nonvested share units, with 3- to 5-year cliff vesting. The weighted average grant date fair value of the nonvested share units was $56.65.