Schedule II - Condensed Financial Information of Registrant (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	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