XML 35 R23.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Reinsurance (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2016
Reinsurance Disclosures [Abstract] |
Schedule of List Of Direct, Assumed, And Ceded Reinsurance Amounts |
|  | Quarter ended March 31,
($ in thousands) |  | 2016 |  | 2015
Premiums written: |  |  |  |  |  |
Direct |  | $ | 646,278 |  |  | 598,783 |
Assumed |  | 6,320 |  |  | 6,081 |
Ceded |  | (87,239 | ) |  | (86,776 | )
Net |  | $ | 565,359 |  |  | 518,088 |
Premiums earned: |  |  |  |  |  |
Direct |  | $ | 606,661 |  |  | 562,042 |
Assumed |  | 6,270 |  |  | 5,908 |
Ceded |  | (90,473 | ) |  | (91,827 | )
Net |  | $ | 522,458 |  |  | 476,123 |
Loss and loss expense incurred: |  |  |  |  |  |
Direct |  | $ | 361,639 |  |  | 312,246 |
Assumed |  | 6,355 |  |  | 4,662 |
Ceded |  | (70,850 | ) |  | (31,909 | )
Net |  | $ | 297,144 |  |  | 284,999 |
Schedule of Ceded Premiums and Losses Related to Flood Operations | Ceded premiums and losses related to our participation in the NFIP, under which 100% of our flood premiums, losses, and loss expenses are ceded to the NFIP, are as follows:
Ceded to NFIP |  | Quarter ended March 31,
($ in thousands) |  | 2016 |  | 2015
Ceded premiums written |  | $ | (53,248 | ) |  | (53,842 | )
Ceded premiums earned |  | (56,814 | ) |  | (58,998 | )
Ceded loss and loss expense incurred |  | (40,718 | ) |  | (6,249 | )

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://www.xbrl.org/2003/role/presentationRef -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