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Investment Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Contractual maturity of amortized cost and fair value of debt securities    
Amortized cost, Due in one year or less $ 3,459  
Amortized cost, Due after one year through five years 74,943  
Amortized cost, Due after five years through ten years 22,022  
Amortized cost, Due after ten years 863  
Amortized cost, Maturity period 101,287  
Amortized cost, Asset-backed securities 109,340  
Amortized cost, Total 210,627  
Fair value, Due in one year or less 3,484  
Fair value, Due after one year through five years 76,232  
Fair value, Due after five years through ten years 22,966  
Fair value, Due after ten years 900  
Fair value, Maturity period 103,582  
Fair value, Asset-backed securities 113,206  
Fair value, Total $ 216,788 $ 213,806