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Investment in Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Amortized Cost $ 290,367 $ 322,087
Gross Unrealized Gains 17,343 19,960
Gross Unrealized Losses 203 112
Fair Value 307,507 341,935
Us States and Political Subdivisions Debt Securities [Member]
   
Amortized Cost 283,625 315,345
Gross Unrealized Gains 17,343 19,960
Gross Unrealized Losses 203 112
Fair Value 300,765 335,193
Certificates Of Deposit [Member]
   
Amortized Cost 6,742 6,742
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 6,742 $ 6,742