XML 35 R27.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Reinsurance (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2013
Reinsurance Disclosures [Abstract] |
List Of Direct, Assumed, And Ceded Reinsurance Amounts |
|  | Quarter ended June 30, |  | Six Months ended June 30,
($ in thousands) |  | 2013 |  | 2012 |  | 2013 |  | 2012
Premiums written: |  |  |  |  |  |  |  |  |  |
Direct |  | $ | 551,190 |  |  | 507,520 |  |  | 1,080,006 |  |  | 983,486 |
Assumed |  | 4,378 |  |  | 4,747 |  |  | 12,860 |  |  | 26,736 |
Ceded |  | (93,391 | ) |  | (86,704 | ) |  | (180,565 | ) |  | (164,487 | )
Net |  | $ | 462,177 |  |  | 425,563 |  |  | 912,301 |  |  | 845,735 |
Premiums earned: |  |  |  |  |  |  |  |  |  |  |  |
Direct |  | $ | 504,081 |  |  | 463,330 |  |  | 998,147 |  |  | 915,318 |
Assumed |  | 8,951 |  |  | 16,039 |  |  | 21,414 |  |  | 31,088 |
Ceded |  | (86,780 | ) |  | (87,157 | ) |  | (172,369 | ) |  | (175,365 | )
Net |  | $ | 426,252 |  |  | 392,212 |  |  | 847,192 |  |  | 771,041 |
Loss and loss expense incurred: |  |  |  |  |  |  |  |  |  |  |  |
Direct |  | $ | 338,954 |  |  | 301,451 |  |  | 704,600 |  |  | 553,654 |
Assumed |  | 6,420 |  |  | 10,470 |  |  | 15,494 |  |  | 21,069 |
Ceded |  | (65,780 | ) |  | (24,018 | ) |  | (170,651 | ) |  | (33,914 | )
Net |  | $ | 279,594 |  |  | 287,903 |  |  | 549,443 |  |  | 540,809 |
Ceded Premiums and Losses Related to Flood Operations |
NFIP |  | Quarter ended June 30, |  | Six Months ended June 30,
($ in thousands) |  | 2013 |  | 2012 |  | 2013 |  | 2012
Ceded premiums written |  | $ | (62,461 | ) |  | (60,525 | ) |  | (119,168 | ) |  | (112,249 | )
Ceded premiums earned |  | (56,450 | ) |  | (52,768 | ) |  | (111,777 | ) |  | (104,673 | )
Ceded loss and loss expense incurred |  | (51,725 | ) |  | (6,754 | ) |  | (127,901 | ) |  | 8,168 |

X
- Definition Schedule of the company's direct, assumed and ceded reinsurance amounts by premiums written, premiums earned, and losses and loss expenses incurred. + References No definition available. + Details
Name: | sigi_ScheduleOfDirectAssumedAndCededReinsuranceAmountsTableTextBlock
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
- Details
Name: | us-gaap_ReinsuranceDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration