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Investment in Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Estimated fair value, less than 12 months $ 28,048 $ 19,758
Unrealized losses, less than 12 months 203 112
Estimated fair value, 12 months or more 0 0
Unrealized losses, 12 months or more 0 0
Estimated fair value, total 28,048 19,758
Unrealized losses, total 203 112
Us States and Political Subdivisions Debt Securities [Member]
    
Estimated fair value, less than 12 months 28,408 19,758
Unrealized losses, less than 12 months 203 112
Estimated fair value, 12 months or more 0 0
Unrealized losses, 12 months or more 0 0
Estimated fair value, total 28,048 19,758
Unrealized losses, total 203 112
Certificates Of Deposit [Member]
    
Estimated fair value, less than 12 months 0 0
Unrealized losses, less than 12 months 0 0
Estimated fair value, 12 months or more 0 0
Unrealized losses, 12 months or more 0 0
Estimated fair value, total 0 0
Unrealized losses, total $ 0 $ 0