XML 58 R24.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Reinsurance (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2014
Reinsurance Disclosures [Abstract] |
Schedule of List Of Direct, Assumed, And Ceded Reinsurance Amounts |
|  | Quarter ended March 31,
($ in thousands) |  | 2014 |  | 2013
Premiums written: |  |  |  |  |  |
Direct |  | $ | 557,891 |  |  | 528,816 |
Assumed |  | 7,850 |  |  | 8,482 |
Ceded |  | (88,991 | ) |  | (87,174 | )
Net |  | $ | 476,750 |  |  | 450,124 |
Premiums earned: |  |  |  |  |  |
Direct |  | $ | 536,700 |  |  | 494,066 |
Assumed |  | 10,185 |  |  | 12,463 |
Ceded |  | (90,390 | ) |  | (85,589 | )
Net |  | $ | 456,495 |  |  | 420,940 |
Loss and loss expense incurred: |  |  |  |  |  |
Direct |  | $ | 358,349 |  |  | 365,646 |
Assumed |  | 7,479 |  |  | 9,074 |
Ceded |  | (45,282 | ) |  | (104,871 | )
Net |  | $ | 320,546 |  |  | 269,849 |
Schedule of Ceded Premiums and Losses Related to Flood Operations |
NFIP |  | Quarter ended March 31,
($ in thousands) |  | 2014 |  | 2013
Ceded premiums written |  | $ | (57,303 | ) |  | (56,707 | )
Ceded premiums earned |  | (58,286 | ) |  | (55,327 | )
Ceded loss and loss expense incurred |  | (7,379 | ) |  | (76,176 | )

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
- Details
Name: | us-gaap_ReinsuranceDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration