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Investment in Securities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Amortized Cost $ 322,087 $ 290,835
Gross Unrealized Gains 19,960 19,797
Gross Unrealized Losses 112 20
Fair Value 341,935 310,612
Us States and Political Subdivisions Debt Securities [Member]
   
Amortized Cost 315,345 287,585
Gross Unrealized Gains 19,960 19,797
Gross Unrealized Losses 112 20
Fair Value 335,193 307,362
Certificates Of Deposit [Member]
   
Amortized Cost 6,742 3,250
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 6,742 $ 3,250