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Long-Term Debt and Subsequent Event (Notes)	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Long-Term Debt and Subsequent Event	Long-Term Debt and Subsequent Event In March 2017, the Corporation issued $125.0 million of senior notes, with a fixed rate of 3.60% and 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 approximately 5.96%.

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- References

No definition available.

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- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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