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Investment in Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Estimated fair value less than 12 months $ 39,964 $ 4,362
Unrealized losses less than 12 months 313 20
Estimated fair value 12 months or more 0 0
Unrealized losses 12 months or more 0 0
Estimated fair value Total 39,964 4,362
Unrealized losses Total 313 20
Us States and Political Subdivisions Debt Securities [Member]
    
Estimated fair value less than 12 months 39,964 4,362
Unrealized losses less than 12 months 313 20
Estimated fair value 12 months or more 0 0
Unrealized losses 12 months or more 0 0
Estimated fair value Total 39,964 4,362
Unrealized losses Total 313 20
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