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Fair Value (Details 6) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Carrying amount and fair value of financial instruments        
Cash and cash equivalents $ 24,228 $ 39,703 $ 43,617 $ 37,432
Interest bearing time deposits with other banks 275 224    
Securities available for sale 715,452 638,107    
Trading securities 3,560 3,233    
Loans held for sale 1,499 1,442    
Net loans 893,077 837,268    
FHLB and other equity interests 6,848 6,537    
Deposits 1,455,421 1,353,851    
Subordinated debentures 20,620 20,620    
Interest rate swap (1,779)      
Carrying Amount [Member]
       
Carrying amount and fair value of financial instruments        
Cash and cash equivalents 24,228 39,703    
Interest bearing time deposits with other banks 275 224    
Securities available for sale 715,452 638,107    
Trading securities 3,560 3,233    
Loans held for sale 1,499 1,442    
Net loans 893,077 837,268    
FHLB and other equity interests 6,848 6,537    
Accrued interest receivable 6,903 6,567    
Deposits (1,455,421) (1,353,851)    
FHLB and other borrowings (82,182) (74,456)    
Subordinated debentures (20,620) (20,620)    
Interest rate swap (1,779) (1,669)    
Accrued interest payable (1,121) (1,308)    
Fair Value [Member]
       
Carrying amount and fair value of financial instruments        
Cash and cash equivalents 24,228 39,703    
Interest bearing time deposits with other banks 281 229    
Securities available for sale 715,452 638,107    
Trading securities 3,560 3,233    
Loans held for sale 1,554 1,470    
Net loans 918,918 862,389    
FHLB and other equity interests    0    
Accrued interest receivable 6,903 6,567    
Deposits (1,458,529) (1,357,415)    
FHLB and other borrowings (91,059) (83,042)    
Subordinated debentures (10,865) (10,906)    
Interest rate swap (1,779) (1,669)    
Accrued interest payable (1,121) (1,308)    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
       
Carrying amount and fair value of financial instruments        
Cash and cash equivalents 24,228      
Interest bearing time deposits with other banks 0      
Securities available for sale 49,574 62,832    
Trading securities 3,403 3,078    
Loans held for sale 0      
Net loans 0      
FHLB and other equity interests         
Accrued interest receivable 264      
Deposits (1,231,487)      
FHLB and other borrowings 0      
Subordinated debentures 0      
Interest rate swap 0 0    
Accrued interest payable (321)      
Significant Other Observable Inputs (Level 2) [Member]
       
Carrying amount and fair value of financial instruments        
Cash and cash equivalents 0      
Interest bearing time deposits with other banks 281      
Securities available for sale 663,447 572,875    
Trading securities 157 155    
Loans held for sale 1,554      
Net loans 0      
FHLB and other equity interests         
Accrued interest receivable 3,527      
Deposits (227,042)      
FHLB and other borrowings (91,059)      
Subordinated debentures 0      
Interest rate swap (1,779)      
Accrued interest payable (783)      
Significant Unobservable Inputs (Level 3) [Member]
       
Carrying amount and fair value of financial instruments        
Cash and cash equivalents 0      
Interest bearing time deposits with other banks 0      
Securities available for sale 2,431 2,400    
Trading securities 0 0    
Loans held for sale 0      
Net loans 918,918      
FHLB and other equity interests         
Accrued interest receivable 3,112      
Deposits 0      
FHLB and other borrowings 0      
Subordinated debentures (10,865)      
Interest rate swap 0 0    
Accrued interest payable $ (17)