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Investment in Securities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Amortized Cost $ 304,454 $ 290,835
Gross Unrealized Gains 18,648 19,797
Gross Unrealized Losses 313 20
Fair Value 322,789 310,612
Us States and Political Subdivisions Debt Securities [Member]
   
Amortized Cost 299,031 287,585
Gross Unrealized Gains 18,648 19,797
Gross Unrealized Losses 313 20
Fair Value 317,366 307,362
Certificates Of Deposit [Member]
   
Amortized Cost 5,423 3,250
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 5,423 $ 3,250