Investments - Schedule of Unrealized Loss on Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Vaule	$ 54,530	$ 46,905
Less than 12 months, Unrealized Losses	659	265
12 months or more, Fair Value	3,051	14,655
12 months or more, Unrealized Losses	349	477
Total, Fair Value	57,581	61,560
Total, Unrealized Losses	1,008	742
Obligations of the state and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Vaule	10,042	6,434
Less than 12 months, Unrealized Losses	259	122
12 months or more, Fair Value	3,051	3,389
12 months or more, Unrealized Losses	349	356
Total, Fair Value	13,093	9,823
Total, Unrealized Losses	608	478
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Vaule	44,488	40,471
Less than 12 months, Unrealized Losses	400	143
12 months or more, Fair Value	0	11,266
12 months or more, Unrealized Losses	0	121
Total, Fair Value	44,488	51,737
Total, Unrealized Losses	$ 400	$ 264