Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments:
Fixed maturity securities-held-to-maturity, at amortized cost (fair value $664,371 and $561,179 in 2014 and 2013, respectively)	$ 639,631	$ 536,583
Fixed maturity securities-available-for-sale, at fair value (cost $327,004 and $244,409 in 2014 and 2013, respectively)	331,242	237,877
Equity securities-available-for-sale, at fair value (cost $0 and $9,482 in 2014 and 2013, respectively)	28	9,302
Short-term investments	33,684	84,422
Other investments	11,748	10,591
Total investments	1,016,333	878,775
Cash and cash equivalents	90,956	123,077
Amounts recoverable from reinsurers	85,888	75,326
Premiums receivable, net of allowance	178,917	171,579
Deferred income taxes	31,231	33,645
Accrued interest receivable	11,637	11,242
Property and equipment, net	7,240	7,549
Deferred policy acquisition costs	19,649	19,171
Federal income tax recoverable	1,082
Other assets	14,287	8,637
Total assets	1,457,220	1,329,001
Liabilities:
Reserves for loss and loss adjustment expenses	687,602	614,557
Unearned premiums	168,576	164,296
Reinsurance premiums payable	843	607
Amounts held for others	42,827	35,739
Policyholder deposits	48,722	44,620
Insurance-related assessments	29,315	25,428
Accounts payable and other liabilities	30,110	26,940
Payable for investments purchased	2,257
Total liabilities	1,010,252	912,187
Shareholders' equity:
Voting-$0.01 par value authorized shares-50,000,000 in 2014 and 2013; 20,155,936 and 19,855,430 shares issued and 18,897,686 and 18,597,180 shares outstanding in 2014 and 2013, respectively	201	198
Additional paid-in capital	199,138	192,537
Treasury stock at cost (1,258,250 shares in 2014 and 2013)	(22,370)	(22,370)
Accumulated earnings	267,189	250,744
Accumulated other comprehensive income (loss), net	2,810	(4,295)
Total shareholders' equity	446,968	416,814
Total liabilities and shareholders' equity	$ 1,457,220	$ 1,329,001