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Allowance for Credit Losses on Premiums Receivable (Tables)

3 Months Ended

Mar. 31, 2023

Premiums Receivable [Abstract]

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

						Quarter ended March 31,
($ in thousands)						2023						2022
Balance at beginning of period						$	16,100					$	13,600
Current period change for expected credit losses						1,910						916
Write-offs charged against the allowance for credit losses						(1,164)						(520)
Recoveries						254						304
Allowance for credit losses, end of period						$	17,100					$	14,300

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 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