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Debt Security, Held To Maturity (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Debt Security, Held To Maturity [Abstract]  
Held to maturity debt securities $ 15,000
Maturity date Oct. 31, 2016
Debt security interest rate above three-month LIBOR rate 4.00%
Held to maturity debt securites, fair value $ 13,811