Investments (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Investments [Abstract]
Increase in total investments	$ 11,600,000
Percentage increase in investments (in hundredths)	8.90%
Ratio of available-for-sale securities to total investments (in hundredths)	95.00%		94.00%
Net realized investment losses charged to operations	0
Schedule of Available-for-sale Securities [Line Items]
Debt maturities, held to maturity, at amortized cost	6,849,000		7,359,000
Irrevocable letter of credit	15,000,000
Amount held in trust	1,000,000		1,000,000
Debt securities, at market [Abstract]
Debt securities, at market	107,764,000		101,755,000
Percent of debt securities at market to total investments (in hundredths)	76.05%		78.22%
Debt securities, at amortized cost [Abstract]
Debt securities, at amortized cost	6,849,000		7,359,000
Percent of debt securities at amortized cost to total investments (in hundredths)	4.83%		5.65%
Total debt securities	114,613,000		109,114,000
Percent of debt securities to total investments (in hundredths)	80.88%		83.87%
Equity securities, at market	27,108,000		20,982,000
Percentage of equity securities to total investments (in hundredths)	19.12%		16.13%
Total investments	141,721,000		130,096,000
Total investments (in hundredths)	100.00%		100.00%
Realized gains (losses) [Abstract]
Total realized gains	1,322,000	749,000
Fair Value at Sale of securities with realized gains	23,680,000	9,569,000
Total realized losses	(509,000)	(759,000)
Fair Value at Sale of securities with realized losses	17,099,000	6,708,000
Net realized gains on investments	813,000	(10,000)
Fair Value of Investments at Sale	40,779,000	16,277,000
Debt Securities - Available-For-Sale [Abstract]
Debt Securities - Available-For-Sale, Amortized Cost	104,490,000		97,121,000
Debt Securities - Available-For-Sale, Gross Unrealized Gains	3,348,000		4,735,000
Debt Securities - Available-For-Sale, Gross Unrealized Losses	74,000		101,000
Debt Securities - Available-For-Sale, Estimated Fair Value	107,764,000		101,755,000
Debt Securities - Held-To-Maturity [Abstract]
Debt Securities - Held-To-Maturity, Amortized Cost	6,849,000		7,359,000
Debt Securities - Held-To-Maturity, Gross Unrealized Gains	161,000		210,000
Debt Securities - Held-To-Maturity, Gross Unrealized Losses	1,000		15,000
Debt Securities - Held-To-Maturity, Estimated Fair Value	7,009,000		7,554,000
Equity securities - common stocks, Amortized Cost	22,676,000		19,095,000
Equity securities - common stocks, Gross Unrealized Gains	4,953,000		2,505,000
Equity securities - common stocks, Gross Unrealized Losses	521,000		618,000
Equity securities - common stocks, Estimated Fair Value	27,108,000		20,982,000
Continuous unrealized loss position [Abstract]
Debt/Equity securities, Unrealized (Losses)	595,000		719,000
Debt/Equity securities, Less than 12 months	328,000		531,000
Debt/Equity securities, 12 months or longer	267,000		188,000
Amortized Cost [Abstract]
Due in one year or less, Amortized Cost	2,264,000		2,925,000
Due after one through five years, Amortized Cost	70,955,000		49,826,000
Due after five through ten years, Amortized Cost	37,384,000		35,070,000
Due after ten years, Amortized Cost	736,000		16,659,000
Total Amortized Cost	111,339,000		104,480,000
Estimated Fair Value [Abstract]
Due in one year or less, Estimated Fair Value	2,295,000		2,944,000
Due after one through five years, Estimated Fair Value	72,528,000		51,523,000
Due after five through ten years, Estimated Fair Value	39,122,000		37,182,000
Due after ten years, Estimated Fair Value	828,000		17,660,000
Total Estimated Fair Value	114,773,000		109,309,000
Investment income [Abstract]
Interest on debt securities	714,000	878,000
Dividends on equity securities	80,000	82,000
Interest on cash and cash equivalents	0	1,000
Total investment income	794,000	961,000
Net realized gains (losses)	813,000	(10,000)
Proceeds from sales and maturity of marketable securities	44,200,000	18,300,000
Net realized and unrealized investment gains (losses) [Abstract]
Net realized gains	813,000	(10,000)
Net unrealized gains	7,706,000	3,289,000
Diverse Industries Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of debt securities to total debt portfolio (in hundredths)	74.00%		69.00%
United States Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of debt securities to total debt portfolio (in hundredths)	26.00%		31.00%
Diverse Industries Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of equity holdings to total equity portfolio (in hundredths)	89.00%		87.00%
Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of equity holdings to total equity portfolio (in hundredths)	11.00%		13.00%
United States Government Obligations and Authorities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt maturities, held to maturity, at amortized cost	4,737,000		6,016,000
Debt securities, at market [Abstract]
Debt securities, at market	24,844,000		27,392,000
Percent of debt securities at market to total investments (in hundredths)	17.53%		21.06%
Debt securities, at amortized cost [Abstract]
Debt securities, at amortized cost	4,737,000		6,016,000
Percent of debt securities at amortized cost to total investments (in hundredths)	3.34%		4.62%
Debt Securities - Available-For-Sale [Abstract]
Debt Securities - Available-For-Sale, Amortized Cost	24,352,000		26,825,000
Debt Securities - Available-For-Sale, Gross Unrealized Gains	502,000		632,000
Debt Securities - Available-For-Sale, Gross Unrealized Losses	10,000		65,000
Debt Securities - Available-For-Sale, Estimated Fair Value	24,844,000		27,392,000
Debt Securities - Held-To-Maturity [Abstract]
Debt Securities - Held-To-Maturity, Amortized Cost	4,737,000		6,016,000
Debt Securities - Held-To-Maturity, Gross Unrealized Gains	124,000		149,000
Debt Securities - Held-To-Maturity, Gross Unrealized Losses	0		12,000
Debt Securities - Held-To-Maturity, Estimated Fair Value	4,861,000		6,153,000
Continuous unrealized loss position [Abstract]
Debt/Equity securities, Unrealized (Losses)	10,000		65,000
Debt/Equity securities, Less than 12 months	10,000		65,000
Debt/Equity securities, 12 months or longer	0		0
Obligations of States and Political Subdivisions [Member]
Debt securities, at market [Abstract]
Debt securities, at market	3,862,000		3,939,000
Percent of debt securities at market to total investments (in hundredths)	2.73%		3.03%
Debt Securities - Available-For-Sale [Abstract]
Debt Securities - Available-For-Sale, Amortized Cost	3,664,000		3,738,000
Debt Securities - Available-For-Sale, Gross Unrealized Gains	199,000		202,000
Debt Securities - Available-For-Sale, Gross Unrealized Losses	1,000		1,000
Debt Securities - Available-For-Sale, Estimated Fair Value	3,862,000		3,939,000
Continuous unrealized loss position [Abstract]
Debt/Equity securities, Unrealized (Losses)	1,000		1,000
Debt/Equity securities, Less than 12 months	1,000		1,000
Debt/Equity securities, 12 months or longer	0		0
Corporate [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt maturities, held to maturity, at amortized cost	2,000,000		1,203,000
Debt securities, at market [Abstract]
Debt securities, at market	75,800,000		67,313,000
Percent of debt securities at market to total investments (in hundredths)	53.49%		51.74%
Debt securities, at amortized cost [Abstract]
Debt securities, at amortized cost	2,000,000		1,203,000
Percent of debt securities at amortized cost to total investments (in hundredths)	1.41%		0.92%
Debt Securities - Available-For-Sale [Abstract]
Debt Securities - Available-For-Sale, Amortized Cost	73,216,000		63,553,000
Debt Securities - Available-For-Sale, Gross Unrealized Gains	2,622,000		3,794,000
Debt Securities - Available-For-Sale, Gross Unrealized Losses	38,000		34,000
Debt Securities - Available-For-Sale, Estimated Fair Value	75,800,000		67,313,000
Debt Securities - Held-To-Maturity [Abstract]
Debt Securities - Held-To-Maturity, Amortized Cost	2,000,000		1,203,000
Debt Securities - Held-To-Maturity, Gross Unrealized Gains	37,000		61,000
Debt Securities - Held-To-Maturity, Gross Unrealized Losses	0		2,000
Debt Securities - Held-To-Maturity, Estimated Fair Value	2,037,000		1,262,000
Continuous unrealized loss position [Abstract]
Debt/Equity securities, Unrealized (Losses)	38,000		34,000
Debt/Equity securities, Less than 12 months	38,000		34,000
Debt/Equity securities, 12 months or longer	0		0
Debt Securities [Member]
Realized gains (losses) [Abstract]
Total realized gains	1,133,000	233,000
Fair Value at Sale of securities with realized gains	22,601,000	6,496,000
Total realized losses	(409,000)	(206,000)
Fair Value at Sale of securities with realized losses	16,476,000	5,042,000
Continuous unrealized loss position [Abstract]
Debt/Equity securities, Unrealized (Losses)	74,000		101,000
Debt/Equity securities, Less than 12 months	74,000		101,000
Debt/Equity securities, 12 months or longer	0		0
Investment income [Abstract]
Net realized gains (losses)	724,000	27,000
Net realized and unrealized investment gains (losses) [Abstract]
Net realized gains	724,000	27,000
Net unrealized gains	3,275,000	2,365,000
Equity Securities [Member]
Realized gains (losses) [Abstract]
Total realized gains	189,000	516,000
Fair Value at Sale of securities with realized gains	1,079,000	3,073,000
Total realized losses	(100,000)	(553,000)
Fair Value at Sale of securities with realized losses	623,000	1,666,000
Investment income [Abstract]
Net realized gains (losses)	89,000	(37,000)
Net realized and unrealized investment gains (losses) [Abstract]
Net realized gains	89,000	(37,000)
Net unrealized gains	4,431,000	924,000
International [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt maturities, held to maturity, at amortized cost	112,000		140,000
Debt securities, at market [Abstract]
Debt securities, at market	3,258,000		3,111,000
Percent of debt securities at market to total investments (in hundredths)	2.30%		2.39%
Debt securities, at amortized cost [Abstract]
Debt securities, at amortized cost	112,000		140,000
Percent of debt securities at amortized cost to total investments (in hundredths)	0.08%		0.11%
Debt Securities - Available-For-Sale [Abstract]
Debt Securities - Available-For-Sale, Amortized Cost	3,258,000		3,005,000
Debt Securities - Available-For-Sale, Gross Unrealized Gains	25,000		107,000
Debt Securities - Available-For-Sale, Gross Unrealized Losses	25,000		1,000
Debt Securities - Available-For-Sale, Estimated Fair Value	3,258,000		3,111,000
Debt Securities - Held-To-Maturity [Abstract]
Debt Securities - Held-To-Maturity, Amortized Cost	112,000		140,000
Debt Securities - Held-To-Maturity, Gross Unrealized Gains	0		0
Debt Securities - Held-To-Maturity, Gross Unrealized Losses	1,000		1,000
Debt Securities - Held-To-Maturity, Estimated Fair Value	111,000		139,000
Continuous unrealized loss position [Abstract]
Debt/Equity securities, Unrealized (Losses)	25,000		1,000
Debt/Equity securities, Less than 12 months	25,000		1,000
Debt/Equity securities, 12 months or longer	0		0
Common Stock [Member]
Continuous unrealized loss position [Abstract]
Debt/Equity securities, Unrealized (Losses)	521,000		618,000
Debt/Equity securities, Less than 12 months	254,000		430,000
Debt/Equity securities, 12 months or longer	267,000		188,000
United States Treasury Notes [Member] | Federated National [Member]
Estimated Fair Value [Abstract]
Due after one through five years, Estimated Fair Value	63,238		63,481
Due after five through ten years, Estimated Fair Value	$ 2,179,368		$ 2,193,300