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Stockholders' Equity and Comprehensive Income (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Stockholders' Equity and Other Comprehensive Income [Abstract] |  |  |
Schedule of Parent's Common Stock |
($ in thousands) |  |  |  |  |
|  | Shares Purchased |  | Cost of Shares Purchased |
|  | in Connection with |  | in Connection with |
|  | Restricted Stock Vestings |  | Restricted Stock Vestings |
Period |  | and Stock Option Exercises |  | and Stock Option Exercises |
2011 |  | 149,997 | $ | 2,741 |
2010 |  | 107,425 |  | 1,686 |
2009 |  | 191,858 |  | 3,010 |
Maximum Payments of Ordinary Dividends |
($ in millions) |  |
Selective Insurance Company of America | $ | 50.7
Selective Way Insurance Company |  | 22.2
Selective Insurance Company of South Carolina |  | 9.1
Selective Insurance Company of the Southeast |  | 6.9
Selective Insurance Company of New York |  | 7.3
Selective Insurance Company of New England |  | 1.4
Selective Auto Insurance Company of New Jersey |  | 6.0
Montpelier U.S. Insurance Company |  | -
Total | $ | 103.6
Components of Comprehensive Income-Gross and Net of Tax |
2011 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income | $ | 7,065 |  | (12,800) |  | 19,865
Components of OCI: |  |  |  |  |  |
Unrealized gains on securities: |  |  |  |  |  |
Unrealized holding gains during the period |  | 70,140 |  | 24,548 |  | 45,592
Portion of OTTI recognized in OCI |  | 1,682 |  | 589 |  | 1,093
Amortization of net unrealized gains on HTM securities |  | (3,097) |  | (1,084) |  | (2,013)
Reclassification adjustment for gains included in net |  |  |  |  |  |
income |  | (1,987) |  | (695) |  | (1,292)
Net unrealized gains |  | 66,738 |  | 23,358 |  | 43,380
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Net actuarial loss |  | (16,799) |  | (5,880) |  | (10,919)
Reversal of amortization items: |  |  |  |  |  |
Net actuarial loss |  | 4,172 |  | 1,460 |  | 2,712
Prior service cost |  | 150 |  | 53 |  | 97
Defined benefit pension and post-retirement plans |  | (12,477) |  | (4,367) |  | (8,110)
Comprehensive income | $ | 61,326 |  | 6,191 |  | 55,135
2010 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income | $ | 76,141 |  | 10,600 |  | 65,541
Components of OCI: |  |  |  |  |  |
Unrealized gains on securities: |  |  |  |  |  |
Unrealized holding gains during the period |  | 44,643 |  | 15,625 |  | 29,018
Portion of OTTI recognized in OCI |  | 5,256 |  | 1,840 |  | 3,416
Amortization of net unrealized gains on HTM securities |  | (11,708) |  | (4,098) |  | (7,610)
Reclassification adjustment for gains included in net |  |  |  |  |  |
income |  | (454) |  | (159) |  | (295)
Net unrealized gains |  | 37,737 |  | 13,208 |  | 24,529
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Net actuarial loss |  | (12,045) |  | (4,216) |  | (7,829)
Reversal of amortization items: |  |  |  |  |  |
Net actuarial loss |  | 4,134 |  | 1,447 |  | 2,687
Prior service cost |  | 150 |  | 53 |  | 97
Defined benefit pension and post-retirement plans |  | (7,761) |  | (2,716) |  | (5,045)
Comprehensive income | $ | 106,117 |  | 21,092 |  | 85,025
2009 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income | $ | 26,253 |  | (10,145) |  | 36,398
Components of OCI: |  |  |  |  |  |
Unrealized gains on securities: |  |  |  |  |  |
Unrealized holding gains during the period |  | 102,514 |  | 35,880 |  | 66,634
Portion of OTTI recognized in OCI |  | (8,659) |  | (3,030) |  | (5,629)
Amortization of net unrealized gains on HTM securities |  | 914 |  | 320 |  | 594
Reclassification adjustment for losses included in net |  |  |  |  |  |
income |  | 38,392 |  | 13,437 |  | 24,955
Net unrealized gains |  | 133,161 |  | 46,607 |  | 86,554
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Net actuarial gain |  | 2,824 |  | 988 |  | 1,836
Reversal of amortization items: |  |  |  |  |  |
Net actuarial loss |  | 5,274 |  | 1,846 |  | 3,428
Curtailment gain |  | (1,387) |  | (485) |  | (902)
Prior service credit |  | (508) |  | (178) |  | (330)
Defined benefit pension and post-retirement plans |  | 6,203 |  | 2,171 |  | 4,032
Comprehensive income | $ | 165,617 |  | 38,633 |  | 126,984
Components of Accumulated Other Comprehensive Income |
|  |  |  |  |  |  |  | Defined |  |
|  |  |  | Benefit |  |
|  |  |  | Pension |  |
|  | Net Unrealized Gain (Loss) |  | and Post- |  |
|  | OTTI |  | HTM |  | All |  | retirement |  | Total
($ in thousands) |  | Related |  | Related |  | Other |  | Plans |  | AOCI
Balance, December 31, 2009 | $ | (8,009) |  | 11,937 |  | 25,410 |  | (41,798) |  | (12,460)
Changes in component during period |  | 3,416 |  | (793) |  | 21,906 |  | (5,045) |  | 19,484
Balance, December 31, 2010 |  | (4,593) |  | 11,144 |  | 47,316 |  | (46,843) |  | 7,024
Changes in component during period |  | 1,093 |  | (6,522) |  | 48,809 |  | (8,110) |  | 35,270
Balance, December 31, 2011 | $ | (3,500) |  | 4,622 |  | 96,125 |  | (54,953) |  | 42,294

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