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Fair Value (Details 6) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
ASSETS        
Cash and cash equivalents $ 38,491 $ 31,881 $ 30,203 $ 39,703
Interest bearing time deposits with other banks 275 225    
Trading securities 5,066 4,459    
Loans held for sale 956 2,398    
Net loans 918,799 913,764    
FHLB and other equity interests 6,597 6,684    
LIABILITIES        
Deposits (1,545,445) (1,485,003)    
Subordinated debentures (20,620) (20,620)    
Carrying Amount [Member]
        
ASSETS        
Cash and cash equivalents 38,491 31,881    
Interest bearing time deposits with other banks 275 225    
Securities available for sale 760,945 737,311    
Trading securities 5,066 4,459    
Loans held for sale 956 2,398    
Net loans 918,799 913,764    
FHLB and other equity interests 6,597 6,684    
Accrued interest receivable 7,451 6,863    
LIABILITIES        
Deposits (1,545,445) (1,485,003)    
FHLB and other borrowings (75,152) (97,806)    
Subordinated debentures (20,620) (20,620)    
Interest Rate Swaps (1,630) (1,745)    
Accrued interest payable (971) (1,022)    
Total Fair Value [Member]
        
ASSETS        
Cash and cash equivalents 38,491 31,881    
Interest bearing time deposits with other banks 281 230    
Securities available for sale 760,945 737,311    
Trading securities 5,066 4,459    
Loans held for sale 981 2,460    
Net loans 922,845 917,785    
Accrued interest receivable 7,451 6,863    
LIABILITIES        
Deposits (1,547,404) (1,487,545)    
FHLB and other borrowings (82,624) (105,850)    
Subordinated debentures (10,999) (10,682)    
Interest Rate Swaps (1,630) (1,745)    
Accrued interest payable (971) (1,022)    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
        
ASSETS        
Cash and cash equivalents 38,491 31,881    
Interest bearing time deposits with other banks 0 0    
Securities available for sale 68,533 54,169    
Trading securities 4,908 4,300    
Loans held for sale 0 0    
Net loans 0 0    
Accrued interest receivable 385 278    
LIABILITIES        
Deposits (1,334,227) (1,272,060)    
FHLB and other borrowings 0 0    
Subordinated debentures 0 0    
Interest Rate Swaps 0 0    
Accrued interest payable (283) (301)    
Significant Other Observable Inputs (Level 2) [Member]
        
ASSETS        
Cash and cash equivalents 0 0    
Interest bearing time deposits with other banks 281 230    
Securities available for sale 689,787 680,562    
Trading securities 158 159    
Loans held for sale 981 2,460    
Net loans 0 0    
Accrued interest receivable 3,879 3,498    
LIABILITIES        
Deposits (213,177) (215,485)    
FHLB and other borrowings (82,624) (105,850)    
Subordinated debentures (10,999) (10,682)    
Interest Rate Swaps (1,630) (1,745)    
Accrued interest payable (671) (707)    
Significant Unobservable Inputs (Level 3) [Member]
        
ASSETS        
Cash and cash equivalents 0 0    
Interest bearing time deposits with other banks 0 0    
Securities available for sale 2,625 2,580    
Trading securities 0 0    
Loans held for sale 0 0    
Net loans 922,845 917,785    
Accrued interest receivable 3,187 3,087    
LIABILITIES        
Deposits 0 0    
FHLB and other borrowings 0 0    
Subordinated debentures 0 0    
Interest Rate Swaps 0 0    
Accrued interest payable $ (17) $ (14)