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Share-Based Compensation Arrangements	6 Months Ended
Share-Based Compensation Arrangements	Jun. 30, 2020
Share-based Payment Arrangement [Abstract]
Share-Based Compensation Arrangements	Share-Based Compensation Arrangements During the six months ended June 30, 2020, the Corporation granted performance share unit awards and nonvested share unit awards. Performance share awards were granted to certain key employees of the Corporation to 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 determined by the closing price of the Corporation’s common stock on the award date. The weighted average fair value of the performance share awards was $34.22. The number of shares to be vested will be contingent upon the Corporation’s attainment of certain performance measures as detailed in the performance share award agreements. The performance share awards will be earned over a 3-year performance period and the current performance assumption estimates that 65,632 shares will be earned. The Corporation granted to certain key employees and non-executive directors 11,765 nonvested share units, with 3-year cliff vesting. The weighted average grant date fair value of the nonvested share units was $39.56.