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Allowance for Credit Losses on Premiums Receivable (Tables)

12 Months Ended

Dec. 31, 2022

Premiums Receivable [Abstract]

Allowance for Credit Losses on Premiums Receivable [Table Text Block]

($ in thousands)												December 31, 2022						December 31, 2021
Balance at beginning of year												$	13,600					21,000
Current period change for expected credit losses												6,065						1,291
Write-offs charged against the allowance for credit losses												(4,978)						(9,343)
Recoveries												1,413						652
ACL, end of year												$	16,100					13,600

X

- Definition

Premiums Receivable

+ References

No definition available.

+ Details

Name:	sigi_PremiumsReceivableAbstract
Namespace Prefix:	sigi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of allowance for credit loss on premium receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

+ Details

Name:	us-gaap_PremiumReceivableAllowanceForCreditLossTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration