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Investment Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Contractual maturity of amortized cost and fair value of debt securities    
Amortized cost, Due in one year or less $ 4,925  
Amortized cost, Due after one year through five years 62,579  
Amortized cost, Due after five years through ten years 36,614  
Amortized cost, Due after ten years 1,147  
Amortized cost, Maturity period 105,265  
Amortized cost, Asset-backed securities 122,624  
Amortized cost, Total 227,889  
Fair value, Due in one year or less 4,992  
Fair value, Due after one year through five years 63,740  
Fair value, Due after five years through ten years 37,214  
Fair value, Due after ten years 1,127  
Fair value, Maturity period 107,073  
Fair value, Asset-backed securities 124,918  
Fair value, Total $ 231,991 $ 200,246