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Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Summary of investments in unrealized loss position that were temporarily impaired    
Less than 12 months - Fair Value $ 32,471 $ 23,899
12 months or more - Fair Value      
Total - Fair Value 32,471 23,899
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (363) (319)
12 months or more - Unrealized (Loss)      
Total Unrealized (Loss) (363) (319)
U.S. agency and mortgage-backed securities [Member]
    
Summary of investments in unrealized loss position that were temporarily impaired    
Less than 12 months - Fair Value 26,066 19,612
12 months or more - Fair Value      
Total - Fair Value 26,066 19,612
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (255) (236)
12 months or more - Unrealized (Loss)      
Total Unrealized (Loss) (255) (236)
Obligations of states and political subdivisions [Member]
    
Summary of investments in unrealized loss position that were temporarily impaired    
Less than 12 months - Fair Value 6,405 4,287
12 months or more - Fair Value      
Total - Fair Value 6,405 4,287
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (108) (83)
12 months or more - Unrealized (Loss)      
Total Unrealized (Loss) $ (108) $ (83)