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Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available for Sale, Amortized Cost    
Available for Sale, Amortized Cost, Due in one year or less $ 340  
Available for Sale, Amortized Cost, Due after one year to five years 1,414  
Available for Sale, Amortized Cost, Due after five to ten years 71,549  
Available for Sale, Amortized Cost, Due after ten years 228,689  
Available for Sale, Amortized Cost, Total debt securities 301,992  
Available for Sale, Amortized Cost, Marketable equity securities 9,764  
Available for Sale, Amortized Cost, Total 311,756 294,996
Available for Sale, Fair Value    
Available for Sale, Fair Value, Due in one year or less 357  
Available for Sale, Fair Value, Due after one year to five years 1,521  
Available for Sale, Fair Value, Due after five to ten years 75,974  
Available for Sale, Fair Value, Due after ten years 235,336  
Available for Sale, Fair Value, Net debt securities 313,188  
Available for Sale, Fair Value, Marketable equity securities 9,968  
Available for sale Securities, Fair Value, Total 323,156 305,332
Held to Maturity, Amortized Cost    
Held to Maturity, Amortized Cost, Due in one year or less 239  
Held to Maturity, Amortized Cost, Due after one year to five years 6,548  
Held to Maturity, Amortized Cost, Due after five to ten years 1,013  
Held to Maturity, Amortized Cost, Due after ten years 179,042  
Held to Maturity, Amortized Cost, Net debt securities 186,842  
Held to Maturity, Amortized Cost, Marketable equity securities     
Held to Maturity, Amortized Cost, Net 186,842 204,956
Held to Maturity, Fair Value    
Held to Maturity, Fair Value, Due in one year or less 241  
Held to Maturity, Fair Value, Due after one year to five years 6,877  
Held to Maturity, Fair Value, Due after five to ten years 1,143  
Held to Maturity, Fair Value, Due after ten years 187,193  
Held to Maturity, Fair Value, Net debt securities 195,454  
Held to Maturity, Fair Value, Marketable equity securities     
Held to Maturity, Fair Value, Total $ 195,454 $ 211,494