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Long-Term Debt (Notes)	6 Months Ended
Long-Term Debt (Notes)	Jun. 30, 2017
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt In March 2017, the Corporation issued $125.0 million of senior notes, with a fixed rate of 3.60% and an effective rate of 3.95%, that mature in 2022. A portion of the net proceeds from this issuance were used to repay $100.0 million of 10-year subordinated notes, which matured on May 1, 2017 and carried a fixed rate of 5.75% and an effective rate of 5.96%.