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Securities (Details 6) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Held for Investment    
Held-to-maturity Securities, Less than Twelve Months, Fair Value $ 115 $ 205
Held-to-maturity Securities, Twelve Months or Longer, Fair Value 1,333   
Held-to-maturity Securities, Fair Value, Total 1,448 205
Held-to-maturity Securities, Less than 12 Months, unrealized losses      
Held-to-maturity Securities, 12 Months or Longer, unrealized losses 8   
Held-to-maturity Securities, unrealized losses, Total 8   
Available for Sale    
Available-for-sale Securities, Less than Twelve Months, Fair Value 21,000 40
Available-for-sale Securities, Twelve Months or Longer, Fair Value 156,572 152,147
Available-for-sale Securities, Fair Value, Total 177,572 152,187
Available-for-sale Securities, Less than 12 Months, unrealized losses 10   
Available-for-sale Securities, 12 Months or Longer, unrealized losses 189 149
Available-for-sale Securities, unrealized losses, Total 199 149
U.S. Federal agencies [Member]
   
Held for Investment    
Held-to-maturity Securities, Less than Twelve Months, Fair Value      
Held-to-maturity Securities, Twelve Months or Longer, Fair Value 6   
Held-to-maturity Securities, Fair Value, Total 6   
Held-to-maturity Securities, Less than 12 Months, unrealized losses      
Held-to-maturity Securities, 12 Months or Longer, unrealized losses     
Held-to-maturity Securities, unrealized losses, Total     
Available for Sale    
Available-for-sale Securities, Less than Twelve Months, Fair Value 20,072   
Available-for-sale Securities, Twelve Months or Longer, Fair Value 151,701 148,576
Available-for-sale Securities, Fair Value, Total 171,773 148,576
Available-for-sale Securities, Less than 12 Months, unrealized losses 7   
Available-for-sale Securities, 12 Months or Longer, unrealized losses 158 116
Available-for-sale Securities, unrealized losses, Total 165 116
States and political subdivisions [Member]
   
Held for Investment    
Held-to-maturity Securities, Less than Twelve Months, Fair Value 115 205
Held-to-maturity Securities, Twelve Months or Longer, Fair Value 1,327   
Held-to-maturity Securities, Fair Value, Total 1,442 205
Held-to-maturity Securities, Less than 12 Months, unrealized losses      
Held-to-maturity Securities, 12 Months or Longer, unrealized losses 8   
Held-to-maturity Securities, unrealized losses, Total 8   
Available for Sale    
Available-for-sale Securities, Less than Twelve Months, Fair Value 928 40
Available-for-sale Securities, Twelve Months or Longer, Fair Value 1,505 3,571
Available-for-sale Securities, Fair Value, Total 2,433 3,611
Available-for-sale Securities, Less than 12 Months, unrealized losses 3   
Available-for-sale Securities, 12 Months or Longer, unrealized losses 17 33
Available-for-sale Securities, unrealized losses, Total 20 33
Other [Member]
   
Available for Sale    
Available-for-sale Securities, Less than Twelve Months, Fair Value     
Available-for-sale Securities, Twelve Months or Longer, Fair Value 3,366  
Available-for-sale Securities, Fair Value, Total 3,366  
Available-for-sale Securities, Less than 12 Months, unrealized losses     
Available-for-sale Securities, 12 Months or Longer, unrealized losses 14  
Available-for-sale Securities, unrealized losses, Total $ 14