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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2019
Segment Reporting [Abstract] |
Schedule of Revenue By Segment |
Revenue by Segment |  | Quarter ended June 30, |  | Six Months ended June 30,
($ in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Standard Commercial Lines: |  |  |  |  |  |  |  |  |  |
Net premiums earned: |  |  |  |  |  |  |  |  |  |
Commercial automobile |  | $ | 136,338 |  |  | 122,104 |  |  | 267,524 |  |  | 240,335 |
Workers compensation |  | 78,464 |  |  | 80,021 |  |  | 157,179 |  |  | 158,844 |
General liability |  | 164,793 |  |  | 153,002 |  |  | 326,318 |  |  | 302,831 |
Commercial property |  | 87,136 |  |  | 82,162 |  |  | 173,203 |  |  | 162,488 |
Businessowners’ policies |  | 26,172 |  |  | 25,829 |  |  | 52,253 |  |  | 51,420 |
Bonds |  | 8,967 |  |  | 8,335 |  |  | 17,871 |  |  | 16,469 |
Other |  | 4,779 |  |  | 4,559 |  |  | 9,485 |  |  | 8,989 |
Miscellaneous income |  | 2,718 |  |  | 2,882 |  |  | 4,762 |  |  | 4,708 |
Total Standard Commercial Lines revenue |  | 509,367 |  |  | 478,894 |  |  | 1,008,595 |  |  | 946,084 |
Standard Personal Lines: |  |  |  |  |  |  |  |
Net premiums earned: |  |  |  |  |  |  |  |
Personal automobile |  | 43,388 |  |  | 41,810 |  |  | 86,551 |  |  | 82,252 |
Homeowners |  | 32,013 |  |  | 32,223 |  |  | 64,143 |  |  | 64,424 |
Other |  | 1,712 |  |  | 1,644 |  |  | 3,726 |  |  | 3,257 |
Miscellaneous income |  | 335 |  |  | 297 |  |  | 611 |  |  | 649 |
Total Standard Personal Lines revenue |  | 77,448 |  |  | 75,974 |  |  | 155,031 |  |  | 150,582 |
E&S Lines: |  |  |  |  |  |  |  |
Net premiums earned: |  |  |  |  |  |  |  |
Casualty lines |  | 44,756 |  |  | 39,379 |  |  | 89,284 |  |  | 77,919 |
Property lines |  | 14,101 |  |  | 13,768 |  |  | 27,655 |  |  | 27,436 |
Miscellaneous income |  | — |  |  | — |  |  | — |  |  | 1 |
Total E&S Lines revenue |  | 58,857 |  |  | 53,147 |  |  | 116,939 |  |  | 105,356 |
Investments: |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  | 58,505 |  |  | 45,553 |  |  | 109,123 |  |  | 88,784 |
Net realized and unrealized investment gains (losses) |  | 4,027 |  |  | (1,652 | ) |  | 17,478 |  |  | (12,201 | )
Total Investments revenue |  | 62,532 |  |  | 43,901 |  |  | 126,601 |  |  | 76,583 |
Total revenues |  | $ | 708,204 |  |  | 651,916 |  |  | 1,407,166 |  |  | 1,278,605 |
Schedule of Income Before and After Federal Income Tax |
Income Before and After Federal Income Tax |  | Quarter ended June 30, |  | Six Months ended June 30,
($ in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Standard Commercial Lines: |  |  |  |  |  |  |  |  |  |
Underwriting gain, before federal income tax |  | $ | 37,143 |  |  | 41,016 |  |  | 62,958 |  |  | 47,820 |
Underwriting gain, after federal income tax |  | 29,343 |  |  | 32,403 |  |  | 49,737 |  |  | 37,778 |
Combined ratio |  | 92.7 | % |  | 91.4 |  |  | 93.7 |  |  | 94.9 |
ROE contribution |  | 5.9 |  |  | 7.8 |  |  | 5.2 |  |  | 4.5 |
Standard Personal Lines: |  |  |  |  |  |  |  |
Underwriting gain, before federal income tax |  | $ | 4,538 |  |  | 4,805 |  |  | 7,705 |  |  | 3,299 |
Underwriting gain, after federal income tax |  | 3,585 |  |  | 3,796 |  |  | 6,087 |  |  | 2,606 |
Combined ratio |  | 94.1 | % |  | 93.7 |  |  | 95.0 |  |  | 97.8 |
ROE contribution |  | 0.7 |  |  | 0.9 |  |  | 0.6 |  |  | 0.3 |
E&S Lines: |  |  |  |  |  |  |  |
Underwriting gain (loss), before federal income tax |  | $ | 2,944 |  |  | (7,789 | ) |  | 7,523 |  |  | (8,354 | )
Underwriting gain (loss), after federal income tax |  | 2,326 |  |  | (6,154 | ) |  | 5,943 |  |  | (6,600 | )
Combined ratio |  | 95.0 | % |  | 114.7 |  |  | 93.6 |  |  | 107.9 |
ROE contribution |  | 0.5 |  |  | (1.5 | ) |  | 0.6 |  |  | (0.8 | )
Investments: |  |  |  |  |  |  |  |  |  |
Net investment income |  | $ | 58,505 |  |  | 45,553 |  |  | 109,123 |  |  | 88,784 |
Net realized and unrealized investment gains (losses) |  | 4,027 |  |  | (1,652 | ) |  | 17,478 |  |  | (12,201 | )
Total investment segment income, before federal income tax |  | 62,532 |  |  | 43,901 |  |  | 126,601 |  |  | 76,583 |
Tax on investment segment income |  | 11,729 |  |  | 7,617 |  |  | 23,849 |  |  | 12,843 |
Total investment segment income, after federal income tax |  | $ | 50,803 |  |  | 36,284 |  |  | 102,752 |  |  | 63,740 |
ROE contribution of after-tax net investment income |  | 9.6 |  |  | 9.0 |  |  | 9.2 |  |  | 8.6 |
Schedule of Reconciliation of Segment Results to Income Before Federal Income Tax |
Reconciliation of Segment Results to Income Before Federal Income Tax |  | Quarter ended June 30, |  | Six Months ended June 30,
($ in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Underwriting gain (loss) |  |  |  |  |  |  |  |
Standard Commercial Lines |  | $ | 37,143 |  |  | 41,016 |  |  | 62,958 |  |  | 47,820 |
Standard Personal Lines |  | 4,538 |  |  | 4,805 |  |  | 7,705 |  |  | 3,299 |
E&S Lines |  | 2,944 |  |  | (7,789 | ) |  | 7,523 |  |  | (8,354 | )
Investment income |  | 62,532 |  |  | 43,901 |  |  | 126,601 |  |  | 76,583 |
Total all segments |  | 107,157 |  |  | 81,933 |  |  | 204,787 |  |  | 119,348 |
Interest expense |  | (7,366 | ) |  | (6,125 | ) |  | (18,892 | ) |  | (12,277 | )
Corporate expenses |  | (9,566 | ) |  | (3,283 | ) |  | (21,976 | ) |  | (14,615 | )
Income, before federal income tax |  | $ | 90,225 |  |  | 72,525 |  |  | 163,919 |  |  | 92,456 |

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