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Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Gross unrealized losses and the fair value of the Company's investments    
Fair Value less than 12 months $ 41,837 $ 25,016
Unrealized losses less than 12 months (168) (167)
Fair value more than 12 months    1,971
Unrealized losses more than 12 months    (27)
Total fair value 41,837 26,987
Total unrealized losses (168) (194)
U.S. Treasury and federal agencies [Member]
    
Gross unrealized losses and the fair value of the Company's investments    
Fair Value less than 12 months 13,064  
Unrealized losses less than 12 months (30)  
Fair value more than 12 months     
Unrealized losses more than 12 months     
Total fair value 13,064  
Total unrealized losses (30)  
State and municipal [Member]
    
Gross unrealized losses and the fair value of the Company's investments    
Fair Value less than 12 months 11,928 1,550
Unrealized losses less than 12 months (84) (44)
Fair value more than 12 months    1,948
Unrealized losses more than 12 months    (27)
Total fair value 11,928 3,498
Total unrealized losses (84) (71)
Federal agency collateralized mortgage obligations [Member]
    
Gross unrealized losses and the fair value of the Company's investments    
Fair Value less than 12 months 12,719  
Unrealized losses less than 12 months (39)  
Fair value more than 12 months     
Unrealized losses more than 12 months     
Total fair value 12,719  
Total unrealized losses (39)  
Federal agency mortgage-backed pools [Member]
    
Gross unrealized losses and the fair value of the Company's investments    
Fair Value less than 12 months 4,126 23,442
Unrealized losses less than 12 months (15) (115)
Fair value more than 12 months    23
Unrealized losses more than 12 months     
Total fair value 4,126 23,465
Total unrealized losses (15) (115)
Corporate notes [Member]
    
Gross unrealized losses and the fair value of the Company's investments    
Fair Value less than 12 months   24
Unrealized losses less than 12 months   (8)
Total fair value   24
Total unrealized losses   $ (8)