Investments, Part III (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of investments aggregated by industry [Abstract]
Carrying Value	$ 241,540	$ 246,892
Amortized Cost	214,214	216,642
Unrealized Gains	27,326	30,250
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	19,614	13,516
12 months or longer	1,680	1,600
Total	21,294	15,116
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]
Less than 12 months	656	189
12 months or longer	320	400
Total	976	589
U.S. Treasury securities and obligations of U.S. Government agencies and authorities [Member]
Schedule of investments aggregated by industry [Abstract]
Carrying Value	23,614	27,512
Amortized Cost	19,932	22,894
Unrealized Gains	3,682	4,618
Obligations of states and political subdivisions [Member]
Schedule of investments aggregated by industry [Abstract]
Carrying Value	17,630	17,761
Amortized Cost	15,240	15,247
Unrealized Gains	2,390	2,514
Utilities and telecom [Member]
Schedule of investments aggregated by industry [Abstract]
Carrying Value	21,615	19,219
Amortized Cost	18,186	15,757
Unrealized Gains	3,429	3,462
Financial services [Member]
Schedule of investments aggregated by industry [Abstract]
Carrying Value	56,330	56,077
Amortized Cost	51,774	51,702
Unrealized Gains	4,556	4,375
Other business - diversified [Member]
Schedule of investments aggregated by industry [Abstract]
Carrying Value	60,120	66,875
Amortized Cost	54,814	59,628
Unrealized Gains	5,306	7,247
Other consumer - diversified [Member]
Schedule of investments aggregated by industry [Abstract]
Carrying Value	58,049	55,269
Amortized Cost	50,086	47,235
Unrealized Gains	7,963	8,034
Other Investment [Member]
Schedule of investments aggregated by industry [Abstract]
Carrying Value	4,182	4,179
Amortized Cost	4,182	4,179
Unrealized Gains	0	0
Corporate securities [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	17,607	8,806
12 months or longer	1,680	1,600
Total	19,287	10,406
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]
Less than 12 months	647	147
12 months or longer	320	400
Total	967	547
Redeemable preferred stocks [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months		1,216
12 months or longer		0
Total		1,216
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]
Less than 12 months		3
12 months or longer		0
Total		3
Common and non-redeemable preferred stocks [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	2,007	3,494
12 months or longer	0	0
Total	2,007	3,494
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]
Less than 12 months	9	39
12 months or longer	0	0
Total	$ 9	$ 39