Financial Statements (Parent Only) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other investments:
Fixed maturity securities available-for-sale at fair value	$ 930,648	$ 883,099
Short-term investments, at fair value	76,502	57,417
Total other investments	930,648	883,099
Cash and cash equivalents	20,224	43,481	38,307	34,756
Accrued investment income	6,387	6,598
Total assets	1,373,131	1,286,532	1,221,255
Liability and Shareholders' Equity
Total liabilities	1,028,083	951,852
Preferred stock
Common stock	95	102
Additional paid-in capital	86,568	98,394
Accumulated other comprehensive income, net	53,628	44,416
Retained earnings	197,015	185,176
Total shareholders' equity	345,048	334,680	318,535
Total liabilities and shareholders' equity	1,373,131	1,286,532
Parent Company [Member]
Assets
Investment in subsidiaries	347,869	323,463
Other investments:
Fixed maturity securities available-for-sale at fair value	6,122	6,946
Short-term investments, at fair value	1,025	80
Secured note receivable from affiliate	350	3,013
Total other investments	7,497	10,039
Cash and cash equivalents	337	550	306	116
Accrued investment income	47	57
Total assets	355,750	334,109
Liability and Shareholders' Equity
Accounts Payable and accrued expenses	18,344	5,921
Total liabilities	18,344	5,921
Preferred stock	100	100
Common stock	95	102
Additional paid-in capital	86,568	98,394
Accumulated other comprehensive income, net	53,628	44,416
Retained earnings	197,015	185,176
Total shareholders' equity	337,306	328,088
Total liabilities and shareholders' equity	$ 355,750	$ 334,109