XML 75 R43.htm IDEA: XBRL DOCUMENT
v3.20.4

Reinsurance (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Reinsurance Disclosures [Abstract] |
Reinsurance Recoverable, Credit Quality Indicator |
|  | December 31, 2020
($ in thousands) |  | Current |  | Past Due |  | Total Reinsurance Recoverables
Financial strength rating of rated reinsurers |  |  |  |  |  |
A++ |  | $ | 37,464 |  |  | $ | 102 |  |  | $ | 37,566 |
A+ |  | 354,846 |  |  | 2,452 |  |  | 357,298 |
A |  | 105,652 |  |  | 415 |  |  | 106,067 |
A- |  | 2,139 |  |  | — |  |  | 2,139 |
B++ |  | 56 |  |  | 324 |  |  | 380 |
B+ |  | — |  |  | — |  |  | — |
Total rated reinsurers |  | $ | 500,157 |  |  | $ | 3,293 |  |  | $ | 503,450 |
Non-rated reinsurers |  |  |  |  |  |
Federal and state pools |  | $ | 82,575 |  |  | $ | — |  |  | $ | 82,575 |
Other than federal and state pools |  | 2,676 |  |  | 568 |  |  | 3,244 |
Total non-rated reinsurers |  | $ | 85,251 |  |  | $ | 568 |  |  | $ | 85,819 |
Total reinsurance recoverable, gross |  | $ | 585,408 |  |  | $ | 3,861 |  |  | $ | 589,269 |
Less: ACL |  |  |  |  |  | (1,777) |
Total reinsurance recoverable, net |  |  |  |  |  | $ | 587,492 |
Reinsurance Recoverable, Allowance for Credit Loss |
($ in thousands) |  |  |  | December 31, 2020
Balance at beginning of year |  |  |  | $ | 4,400 |
Cumulative effect adjustment 1 |  |  |  | (2,903) |
Balance at beginning of year, as adjusted |  |  |  | $ | 1,497 |
Current period provision for expected credit losses |  |  |  | 280 |
Write-offs charged against the allowance for credit losses |  |  |  | — |
Recoveries |  |  |  | — |
ACL, end of year |  |  |  | $ | 1,777 |
1 See Note 3. "Adoption of Accounting Pronouncements" for additional information regarding our adoption of ASU 2016-13.
Schedule of Total Reinsurance Balances Segregated By Reinsurer |
|  | As of December 31, 2020 |  | As of December 31, 2019
($ in thousands) |  | Reinsurance Balances |  | % of Reinsurance Balance |  | Reinsurance Balances |  | % of Reinsurance Balance
Total reinsurance recoverables |  | $ | 587,492 |  |  |  |  | $ | 573,235 |  |  |
Total prepaid reinsurance premiums |  | 170,531 |  |  |  |  | 166,705 |  |  |
Total reinsurance balance |  | 758,023 |  |  |  |  | 739,940 |  |  |
Federal and state pools 1: |  |  |  |  |  |  |  |
NFIP |  | 178,532 |  |  | 25 | % |  | 175,472 |  |  | 24 %
New Jersey Unsatisfied Claim Judgment Fund |  | 52,053 |  |  | 6 |  |  | 53,732 |  |  | 6 %
Other |  | 1,625 |  |  | — |  |  | 2,449 |  |  | 1 |
Total federal and state pools |  | 232,210 |  |  | 31 |  |  | 231,653 |  |  | 31 |
Remaining reinsurance balance |  | $ | 525,813 |  |  | 69 |  |  | $ | 508,287 |  |  | 69 |
Munich Re Group (AM Best rated "A+") |  | $ | 116,885 |  |  | 15 |  |  | $ | 119,748 |  |  | 16 |
Hannover Ruckversicherungs AG (AM Best rated "A+") |  | 115,084 |  |  | 15 |  |  | 107,474 |  |  | 15 |
AXIS Reinsurance Company (AM Best rated "A") |  | 78,090 |  |  | 10 |  |  | 73,009 |  |  | 10 |
Swiss Re Group (AM Best rated "A+") |  | 33,179 |  |  | 4 |  |  | 37,190 |  |  | 5 |
Transatlantic Reinsurance Company (AM Best rated “A+”) |  | 24,320 |  |  | 3 |  |  | 21,824 |  |  | 3 |
All other reinsurers |  | 158,255 |  |  | 22 |  |  | 149,042 |  |  | 20 |
Total reinsurers |  | 525,813 |  |  | 69 | % |  | 508,287 |  |  | 69 | %
Less: collateral 2 |  | (130,169) |  |  |  |  | (110,549) |  |  |
Reinsurers, net of collateral |  | $ | 395,644 |  |  |  |  | $ | 397,738 |  |  |
1 Considered to have minimal risk of default. 2 Includes letters of credit, trust funds, and funds held against reinsurance recoverables.
Schedule of List Of Direct, Assumed, And Ceded Reinsurance Amounts |
($ in thousands) |  | 2020 |  | 2019 |  | 2018
Premiums written: |  |  |  |  |  |
Direct |  | $ | 3,204,512 |  |  | 3,084,451 |  |  | 2,890,633 |
Assumed |  | 24,288 |  |  | 24,339 |  |  | 26,250 |
Ceded |  | (455,708) |  |  | (429,366) |  |  | (402,597) |
Net |  | $ | 2,773,092 |  |  | 2,679,424 |  |  | 2,514,286 |
Premiums earned: |  |  |  |  |  |
Direct |  | $ | 3,108,687 |  |  | 2,993,157 |  |  | 2,808,764 |
Assumed |  | 25,010 |  |  | 24,399 |  |  | 25,831 |
Ceded |  | (451,883) |  |  | (420,385) |  |  | (398,366) |
Net |  | $ | 2,681,814 |  |  | 2,597,171 |  |  | 2,436,229 |
Loss and loss expense incurred: |  |  |  |  |  |
Direct |  | $ | 1,822,034 |  |  | 1,714,880 |  |  | 1,706,951 |
Assumed |  | 17,201 |  |  | 22,879 |  |  | 21,469 |
Ceded |  | (203,412) |  |  | (186,268) |  |  | (230,286) |
Net |  | $ | 1,635,823 |  |  | 1,551,491 |  |  | 1,498,134 |
Schedule of Ceded Premiums and Losses Related to Flood Operations |
Ceded to NFIP ($ in thousands) |  | 2020 |  | 2019 |  | 2018
Ceded premiums written |  | $ | (274,042) |  |  | (266,925) |  |  | (248,053) |
Ceded premiums earned |  | (271,598) |  |  | (259,119) |  |  | (244,238) |
Ceded loss and loss expense incurred |  | (78,993) |  |  | (71,676) |  |  | (144,967) |

X
- Definition This table discloses the premiums and losses and loss expenses that are ceded to the National Flood Insurance Program. + References No definition available. + Details
Name: | sigi_ScheduleOfFloodCededPremiumsAndLossesTableTextBlock
Namespace Prefix: | sigi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
Name: | us-gaap_EffectsOfReinsuranceTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of allowance for credit loss on reinsurance recoverable. + 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=121599337&loc=SL82919249-210447 + Details
Name: | us-gaap_ReinsuranceRecoverableAllowanceForCreditLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of credit quality indicator for reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 + Details
Name: | us-gaap_ReinsuranceRecoverableCreditQualityIndicatorTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of reinsurer or group of reinsurers for whom the entity has a concentration of credit risk. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195 + Details
Name: | us-gaap_ScheduleOfCededCreditRiskByReinsurerTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration