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Schedule II - Condensed Financial Information of Registrant (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income | $ 6,698 | $ 6,801 | $ 6,605 | $ 6,914 | $ 6,702 | $ 6,495 | $ 6,597 | $ 6,546 | $ 27,018 | $ 26,340 | $ 26,242
Fee and other income |  |  |  |  |  |  |  |  | 562 | 1,080 | 584
Total revenues | 85,583 | 80,374 | 76,637 | 78,654 | 74,910 | 71,743 | 67,051 | 66,959 | 321,248 | 280,663 | 248,156
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 566 | 1,311 | 1,548
Total expenses |  |  |  |  |  |  |  |  | 284,105 | 253,306 | 203,934
Income (loss) before income taxes and equity in earnings of subsidiaries | 12,674 | 9,003 | 4,033 | 11,433 | 9,517 | 5,518 | 4,832 | 7,490 | 37,143 | 27,357 | 44,222
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 7,790 | 3,176 | 9,702
Net income | 9,226 | 7,121 | 3,445 | 9,561 | 8,073 | 4,884 | 4,594 | 6,630 | 29,353 | 24,181 | 34,520
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 571 | 478 | (211)
Fee and other income |  |  |  |  |  |  |  |  | 4,765 | 9,710 | 7,258
Total revenues |  |  |  |  |  |  |  |  | 5,336 | 10,188 | 7,047
Expenses |  |  |  |  |  |  |  |  |  |  |
Other operating costs |  |  |  |  |  |  |  |  | 4,770 | 4,827 | 6,956
Interest expense |  |  |  |  |  |  |  |  | 566 | 1,311 | 1,548
Total expenses |  |  |  |  |  |  |  |  | 5,336 | 6,138 | 8,504
Income (loss) before income taxes and equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  | 4,050 | (1,457)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (9) | 1,213 | (307)
Gain (loss) before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 9 | 2,837 | (1,150)
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 29,344 | 21,344 | 35,670
Net income |  |  |  |  |  |  |  |  | $ 29,353 | $ 24,181 | $ 34,520

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