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Indebtedness Indebtedness	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt Disclosure	Indebtedness Our long-term debt balance has not changed materially since December 31, 2017. However, Selective Insurance Company of America ("SICA") borrowed the following short-term funds in the first quarter of 2018 from the FHLBNY: • On February 27, 2018, SICA borrowed $75 million at an interest rate of 1.75%. This borrowing was repaid on March 20, 2018; and • On March 28, 2018, SICA borrowed $55 million at an interest rate of 1.98%. This borrowing was repaid on April 18, 2018. For detailed information on our indebtedness, see Note 10. "Indebtedness" in Item 8. "Financial Statements and Supplementary Data." of our 2017 Annual Report.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-URI http://asc.fasb.org/topic&trid=2208564

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