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Allowance for Uncollectible Premiums Receivable (Tables)

3 Months Ended

Mar. 31, 2022

Premiums Receivable [Abstract]

Premium Receivable, Allowance for Credit Loss [Table Text Block]

						Quarter ended March 31,
($ in thousands)						2022						2021
Balance at beginning of period						$	13,600					$	21,000
Current period change for expected credit losses						916						808
Write-offs charged against the allowance for credit losses						(520)						(874)
Recoveries						304						66
Allowance for credit losses, end of period						$	14,300					$	21,000

X

- Definition

Premiums Receivable [Abstract]

+ 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 http://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