XML 83 R51.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Leases (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Leases [Abstract] |
Components of Lease Expense |
($ in thousands) |  | 2023 |  | 2022
Operating lease cost, included in Other insurance expenses on the Consolidated Statements of Income |  | $ | 7,409 |  |  | 8,148 |
Finance lease cost: |  |  |  |
Amortization of assets, included in Other insurance expenses on the Consolidated Statements of Income |  | 2,692 |  |  | 2,440 |
Interest on lease liabilities, included in Interest expense on the Consolidated Statements of Income |  | 66 |  |  | 46 |
Total finance lease cost |  | 2,758 |  |  | 2,486 |
Variable lease cost, included in Other insurance expenses on the Consolidated Statements of Income |  | 996 |  |  | 1,384 |
Short-term lease cost, included in Other insurance expenses on the Consolidated Statements of Income |  | $ | 411 |  |  | 166 |
Supplemental Lease Information |
|  | December 31, 2023 |  | December 31, 2022
Weighted-average remaining lease term |  |  |  |  |
Operating leases |  | 7 |  | 8 | years
Finance leases |  | 2 |  | 2 |
Weighted-average discount rate |  |  |  |  |
Operating leases |  | 2.8 |  |  | 2.6 |  | %
Finance leases |  | 3.5 |  |  | 1.2 |  |
Lease Assets and Liabilities |
($ in thousands) |  | December 31, 2023 |  | December 31, 2022
Operating leases |  |  |  |
Other assets |  | $ | 41,256 |  |  | 42,403 |
Other liabilities |  | 43,675 |  |  | 44,505 |
Finance leases |  |  |  |
Property and equipment - at cost, net of accumulated depreciation and amortization |  | 2,605 |  |  | 3,713 |
Long-term debt |  | $ | 2,636 |  |  | 3,718 |
Maturities of Lease Liabilities |
($ in thousands) |  | Finance Leases |  | Operating Leases |  | Total
Year ended December 31, |  |  |  |  |  |
2024 |  | $ | 3,002 |  |  | 7,624 |  |  | 10,626 |
2025 |  | 2,859 |  |  | 7,749 |  |  | 10,608 |
2026 |  | 2,482 |  |  | 7,413 |  |  | 9,895 |
2027 |  | 702 |  |  | 7,109 |  |  | 7,811 |
2028 |  | — |  |  | 6,889 |  |  | 6,889 |
Thereafter |  | — |  |  | 18,605 |  |  | 18,605 |
Total lease payments |  | 9,045 |  |  | 55,389 |  |  | 64,434 |
Less: imputed interest |  | 112 |  |  | 4,221 |  |  | 4,333 |
Less: leases that have not yet commenced |  | 6,297 |  |  | 7,493 |  |  | 13,790 |
Total lease liabilities |  | $ | 2,636 |  |  | 43,675 |  |  | 46,311 |

X
- Definition Operating and finance lease asset and liability balances. + References No definition available. + Details
Name: | sigi_LeaseAssetsandLiabilitiesTableTextBlock
Namespace Prefix: | sigi_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of undiscounted cash flows of lessee's finance and operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance and operating lease liability recognized in statement of financial position. + References No definition available. + Details
Name: | sigi_LeaseLiabilityPaymentsDueTableTextBlock
Namespace Prefix: | sigi_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Supplemental information about operating and finance leases, including weighted average remaining lease term and weighted average discount rates. + References No definition available. + Details
Name: | sigi_SupplementalLeaseInformationTableTextBlock
Namespace Prefix: | sigi_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
Name: | us-gaap_LeaseCostTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration