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Allowance for Credit Losses on Premiums Receivable (Tables)

9 Months Ended

Sep. 30, 2022

Premiums Receivable [Abstract]

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

						Quarter ended September 30,												Nine Months ended September 30,
($ in thousands)						2022						2021						2022						2021
Balance at beginning of period						$	14,900					$	18,300					$	13,600					$	21,000
Current period change for expected credit losses						2,250						180						4,335						1,721
Write-offs charged against the allowance for credit losses						(2,349)						(2,154)						(3,787)						(6,554)
Recoveries						399						174						1,052						333
Allowance for credit losses, end of period						$	15,200					$	16,500					$	15,200					$	16,500

X

- Definition

Premiums Receivable [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	sigi_
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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
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Balance Type:	na
Period Type:	duration