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Schedule - Summary of Investments - Other Than Investments in Related Parties | 12 Months Ended
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Dec. 31, 2011
Summary of Investments, Other than Investments in Related Parties [Abstract] |
Summary of Investments, Other than Investments in Related Parties | SCHEDULE III SELECTIVE INSURANCE GROUP, INC. AND CONSOLIDATED SUBSIDIARIES SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES December 31, 2011
Types of investment |  | Amortized Cost |  | Fair |  | Carrying
($ in thousands) |  | or Cost |  | Value |  | Amount
Fixed maturity securities: |  |  |  |  |  |
Held-to-maturity |  |  |  |  |  |
Foreign government obligations | $ | 5,292 |  | 5,496 |  | 5,584
Obligations of states and political subdivisions |  | 614,118 |  | 657,385 |  | 626,012
Public utilities |  | 13,800 |  | 15,426 |  | 13,725
Corporate securities |  | 51,040 |  | 54,112 |  | 48,926
Asset-backed securities |  | 8,077 |  | 7,954 |  | 6,608
Commercial mortgage-backed securities |  | 14,455 |  | 17,670 |  | 11,493
Total fixed maturity securities, held-to-maturity |  | 706,782 |  | 758,043 |  | 712,348
Available-for-sale: |  |  |  |  |  |
U.S. government and government agencies |  | 333,504 |  | 353,796 |  | 353,796
Foreign government obligations |  | 33,687 |  | 34,173 |  | 34,173
Obligations of states and political subdivisions |  | 578,214 |  | 622,659 |  | 622,659
Public utilities |  | 72,145 |  | 75,626 |  | 75,626
Corporate securities |  | 1,096,294 |  | 1,137,684 |  | 1,137,684
Asset-backed securities |  | 77,706 |  | 78,949 |  | 78,949
Commercial mortgage-backed securities |  | 107,838 |  | 112,598 |  | 112,598
Residential mortgage-backed securities |  | 467,468 |  | 481,888 |  | 481,888
Total fixed maturity securities, available-for-sale |  | 2,766,856 |  | 2,897,373 |  | 2,897,373
Equity securities: |  |  |  |  |  |
Common stock: |  |  |  |  |  |
Public utilities |  | 7,143 |  | 8,307 |  | 8,307
Banks, trust and insurance companies |  | 18,405 |  | 19,118 |  | 19,118
Industrial, miscellaneous and all other |  | 118,278 |  | 129,930 |  | 129,930
Total equity securities, available-for-sale |  | 143,826 |  | 157,355 |  | 157,355
Short-term investments |  | 217,044 |  |  |  | 217,044
Other investments |  | 128,301 |  |  |  | 128,301
Total investments | $ | 3,962,809 |  |  |  | 4,112,421

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- Definition The entire disclosure for the schedule applicable to insurance companies summarizing investments held as of the most recent audited balance sheet. At a minimum, such summary is by three major categories of investments including: (1) fixed maturities primarily consisting of bonds, including convertibles and bonds with warrants, and redeemable preferred stocks, (2) equity securities primarily consisting of common stocks and nonredeemable preferred stocks, and (3) other investments including mortgage loans on real estate, real estate held for investment, real estate acquired in satisfaction of debt, policy loans, other long-term investments, and short-term investments not otherwise categorized. The information provided with respect to each item within each category includes: (A) the original cost of equity securities and, as to fixed maturity securities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts, (B) fair value as of the reporting date, and (C) the amount at which the item within each category is shown in the statement of financial position; with respect to (C), if the amount at which shown in the statement of financial position is different from the items original [amortized] cost or fair value, an explanation of the difference may be included herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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