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Investments - Schedule of Unrealized Loss on Investments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Vaule $ 17,304 $ 111,846
Less than 12 months, Unrealized Losses 73 1,672
12 months or more, Fair Value 12,549 7,230
12 months or more, Unrealized Losses 489 377
Total, Fair Value 29,853 119,076
Total, Unrealized Losses 562 2,049
Obligations of U.S. government sponsored enterprises
   
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Vaule   23,389
Less than 12 months, Unrealized Losses   66
12 months or more, Fair Value   0
12 months or more, Unrealized Losses   0
Total, Fair Value   23,389
Total, Unrealized Losses   66
Obligations of the state and political subdivisions
   
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Vaule 540 1,503
Less than 12 months, Unrealized Losses 2 8
12 months or more, Fair Value 3,388 3,027
12 months or more, Unrealized Losses 358 373
Total, Fair Value 3,928 4,530
Total, Unrealized Losses 360 381
Residential mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Vaule 16,764 86,954
Less than 12 months, Unrealized Losses 71 1,598
12 months or more, Fair Value 9,161 4,203
12 months or more, Unrealized Losses 131 4
Total, Fair Value 25,925 91,157
Total, Unrealized Losses $ 202 $ 1,602