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Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Gross unrealized losses and the fair value of the Company's investments    
Fair Value less than 12 months $ 78,665 $ 41,837
Unrealized losses less than 12 months (346) (168)
Fair value more than 12 months      
Unrealized losses more than 12 months      
Total fair value 78,665 41,837
Total unrealized losses (346) (168)
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 15,552 13,064
Unrealized losses less than 12 months (38) (30)
Fair value more than 12 months      
Unrealized losses more than 12 months      
Total fair value 15,552 13,064
Total unrealized losses (38) (30)
State and municipal [Member]
    
Gross unrealized losses and the fair value of the Company's investments    
Fair Value less than 12 months 16,027 11,928
Unrealized losses less than 12 months (199) (84)
Fair value more than 12 months      
Unrealized losses more than 12 months      
Total fair value 16,027 11,928
Total unrealized losses (199) (84)
Federal agency collateralized mortgage obligations [Member]
    
Gross unrealized losses and the fair value of the Company's investments    
Fair Value less than 12 months 31,845 12,719
Unrealized losses less than 12 months (83) (39)
Fair value more than 12 months      
Unrealized losses more than 12 months      
Total fair value 31,845 12,719
Total unrealized losses (83) (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 15,241 4,126
Unrealized losses less than 12 months (26) (15)
Fair value more than 12 months      
Unrealized losses more than 12 months      
Total fair value 15,241 4,126
Total unrealized losses $ (26) $ (15)