XML 41 R27.htm IDEA: XBRL DOCUMENT
v3.20.2

Reinsurance (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2020
Reinsurance Disclosures [Abstract] |
Reinsurance Recoverable, Credit Quality Indicator [Table Text Block] |
|  | September 30, 2020
($ in thousands) |  | Current |  | Past Due |  | Total Reinsurance Recoverables
Financial strength rating of rated reinsurers 1 |  |  |  |  |  |
A++ |  | $ | 23,497 |  |  | $ | 230 |  |  | $ | 23,727 |
A+ |  | 251,341 |  |  | 3,102 |  |  | 254,443 |
A |  | 103,560 |  |  | 1,569 |  |  | 105,129 |
A- |  | 115,196 |  |  | — |  |  | 115,196 |
B++ |  | 95 |  |  | 288 |  |  | 383 |
B+ |  | 10 |  |  | — |  |  | 10 |
Total rated reinsurers |  | $ | 493,699 |  |  | $ | 5,189 |  |  | $ | 498,888 |
Non-rated reinsurers |  |  |  |  |  |
Federal and state pools |  | $ | 111,399 |  |  | $ | — |  |  | $ | 111,399 |
Other than federal and state pools |  | 2,919 |  |  | 81 |  |  | 3,000 |
Total non-rated reinsurers |  | $ | 114,318 |  |  | $ | 81 |  |  | $ | 114,399 |
Total reinsurance recoverable, gross |  | $ | 608,017 |  |  | $ | 5,270 |  |  | $ | 613,287 |
Less: allowance for credit losses 2 |  |  |  |  |  | (1,831) |
Total reinsurance recoverable, net |  |  |  |  |  | $ | 611,456 |
1 Credit ratings as of September 30, 2020.
Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block] |
($ in thousands) |  | Quarter ended September 30, 2020 |  | Nine Months ended September 30, 2020
Balance at beginning of period |  | $ | 2,396 |  |  | $ | 4,400 |
Cumulative effect adjustment 1 |  | — |  |  | (2,903) |
Balance at beginning of period, as adjusted |  | $ | 2,396 |  |  | $ | 1,497 |
Current period provision for expected credit losses |  | (565) |  |  | 334 |
Write-offs charged against the allowance for credit losses |  | — |  |  | — |
Recoveries |  | — |  |  | — |
Allowance for credit losses, end of period |  | $ | 1,831 |  |  | $ | 1,831 |
1 See Note 2. "Adoption of Accounting Pronouncements" for additional information regarding our adoption of ASU 2016-13.
Schedule of List Of Direct, Assumed, And Ceded Reinsurance Amounts |
|  | Quarter ended September 30, |  | Nine Months ended September 30,
($ in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Premiums written: |  |  |  |  |  |  |  |
Direct |  | $ | 839,275 |  |  | 785,680 |  |  | $ | 2,420,350 |  |  | 2,359,441 |
Assumed |  | 5,450 |  |  | 6,882 |  |  | 17,902 |  |  | 18,770 |
Ceded |  | (125,217) |  |  | (115,634) |  |  | (346,665) |  |  | (326,939) |
Net |  | $ | 719,508 |  |  | 676,928 |  |  | $ | 2,091,587 |  |  | 2,051,272 |
Premiums earned: |  |  |  |  |  |  |  |
Direct |  | $ | 803,957 |  |  | 752,872 |  |  | $ | 2,292,495 |  |  | 2,221,257 |
Assumed |  | 6,147 |  |  | 6,356 |  |  | 18,375 |  |  | 18,660 |
Ceded |  | (115,563) |  |  | (105,608) |  |  | (333,955) |  |  | (311,105) |
Net |  | $ | 694,541 |  |  | 653,620 |  |  | $ | 1,976,915 |  |  | 1,928,812 |
Loss and loss expenses incurred: |  |  |  |  |  |  |  |
Direct |  | $ | 530,192 |  |  | 437,617 |  |  | $ | 1,407,000 |  |  | 1,297,975 |
Assumed |  | 4,232 |  |  | 4,362 |  |  | 13,430 |  |  | 13,975 |
Ceded |  | (86,622) |  |  | (43,304) |  |  | (168,355) |  |  | (145,712) |
Net |  | $ | 447,802 |  |  | 398,675 |  |  | $ | 1,252,075 |  |  | 1,166,238 |
COVID 19 Impact [Table Text Block] |
COVID-19 Impact |  | Quarter ended September 30, 2020 |  | Nine Months ended September 30, 2020
($ in thousands) |  | Premium Audit |  |  | Premium Credit |  | Total |  | Premium Audit |  | Property IBNR |  | Premium Credit |  | Total
DPW |  | $ | — |  |  |  | — |  |  | — |  |  | $ | (75,000) |  |  | — |  |  | (19,740) |  |  | (94,740) |
Direct premiums earned |  | (16,303) |  |  |  | — |  |  | (16,303) |  |  | (64,636) |  |  | — |  |  | (19,740) |  |  | (84,376) |
Direct loss and loss expenses incurred |  | (9,468) |  |  |  | — |  |  | (9,468) |  |  | (37,541) |  |  | 10,000 |  |  | (19,740) |  |  | (47,281) |
Schedule of Ceded Premiums and Losses Related to Flood Operations |
Ceded to NFIP |  | Quarter ended September 30, |  | Nine Months ended September 30,
($ in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Ceded premiums written |  | $ | (77,318) |  |  | (74,863) |  |  | $ | (213,592) |  |  | (206,451) |
Ceded premiums earned |  | (68,427) |  |  | (65,846) |  |  | (202,656) |  |  | (191,914) |
Ceded loss and loss expenses incurred |  | (48,132) |  |  | (27,459) |  |  | (66,219) |  |  | (62,208) |

X
- Definition [Table Text Block] COVID-19 impact on direct premiums written, direct premiums earned, and direct loss and loss expenses incurred, as a result of the market disruption caused by COVID-19. [Table] + References No definition available. + Details
Name: | sigi_COVID19ImpactTableTextBlock
Namespace Prefix: | sigi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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