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Allowance for Loan Losses and Credit Quality Indicators (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment $ 7,090   $ 7,090   $ 6,935
Impaired loans with no related allowance, Unpaid Principal balance 8,064   8,064   7,107
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired 16,071   16,071   17,221
Impaired loans with a related allowance, Unpaid Principal Balance 21,676   21,676   17,505
Impaired loans with a related allowance, Related Allowance 6,326   6,326   5,198
Total impaired loans, Recorded Investment 23,161   23,161   24,156
Total impaired loans, Unpaid Principal Balance 29,740   29,740   24,612
Total impaired loans, Related Allowance 6,326   6,326   5,198
Impaired loans with no related allowance, Interest Income Recognized 86 56 244 116  
Impaired loans with no related allowance, Average Recorded Investment 9,511 7,220 13,251 11,327  
Impaired loans with a related allowance, Average Recorded Investment 16,220 20,125 16,729 14,879  
Impaired loans with a related allowance, Interest Income Recognized 105 186 578 354  
Total impaired loans, Average Recorded Investment 25,731 27,345 29,980 26,206  
Total impaired loans, Interest Income Recognized 191 242 822 470  
Construction, development, and other land [Member] | Commercial loans [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment 1,556   1,556   661
Impaired loans with no related allowance, Unpaid Principal balance 2,306   2,306   661
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired           112
Impaired loans with a related allowance, Unpaid Principal Balance           112
Impaired loans with a related allowance, Related Allowance           4
Impaired loans with no related allowance, Interest Income Recognized         1  
Impaired loans with no related allowance, Average Recorded Investment 784 83 1,296 1,538  
Impaired loans with a related allowance, Average Recorded Investment 55 381 55 293  
Impaired loans with a related allowance, Interest Income Recognized    4 1 7  
Commercial and industrial [Member] | Commercial loans [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment 836   836   114
Impaired loans with no related allowance, Unpaid Principal balance 836   836   127
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired 3,293   3,293   4,031
Impaired loans with a related allowance, Unpaid Principal Balance 8,273   8,273   4,069
Impaired loans with a related allowance, Related Allowance 3,293   3,293   2,048
Impaired loans with no related allowance, Interest Income Recognized 3 4 13 4  
Impaired loans with no related allowance, Average Recorded Investment 449 221 559 2,791  
Impaired loans with a related allowance, Average Recorded Investment 3,600 4,066 3,662 1,802  
Impaired loans with a related allowance, Interest Income Recognized    8 163 16  
Multi-family residential [Member] | Commercial loans [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment 365   365   278
Impaired loans with no related allowance, Unpaid Principal balance 365   365   278
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired 386   386     
Impaired loans with a related allowance, Unpaid Principal Balance 398   398     
Impaired loans with a related allowance, Related Allowance 26   26    
Impaired loans with no related allowance, Interest Income Recognized    10 4 24  
Impaired loans with no related allowance, Average Recorded Investment 591 962 1,146 1,370  
Impaired loans with a related allowance, Average Recorded Investment 193 591 1,309 627  
Impaired loans with a related allowance, Interest Income Recognized            
Single family non-owner occupied [Member] | Commercial loans [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment           1,206
Impaired loans with no related allowance, Unpaid Principal balance           1,244
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired 1,237   1,237   2,232
Impaired loans with a related allowance, Unpaid Principal Balance 1,290   1,290   2,232
Impaired loans with a related allowance, Related Allowance 661   661   124
Impaired loans with no related allowance, Interest Income Recognized 4 10 29 29  
Impaired loans with no related allowance, Average Recorded Investment 954 2,481 524 1,673  
Impaired loans with a related allowance, Average Recorded Investment 2,066 2,258 619 2,345  
Impaired loans with a related allowance, Interest Income Recognized    27 57 81  
Non-farm, non-residential [Member] | Commercial loans [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment 2,351   2,351   1,616
Impaired loans with no related allowance, Unpaid Principal balance 2,405   2,405   1,647
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired 6,287   6,287   5,317
Impaired loans with a related allowance, Unpaid Principal Balance 6,743   6,743   5,480
Impaired loans with a related allowance, Related Allowance 1,256   1,256   1,819
Impaired loans with no related allowance, Interest Income Recognized 41 6 65 16  
Impaired loans with no related allowance, Average Recorded Investment 1,584 1,059 2,872 1,894  
Impaired loans with a related allowance, Average Recorded Investment 6,454 6,430 5,802 3,709  
Impaired loans with a related allowance, Interest Income Recognized 90 98 291 109  
Agricultural [Member] | Commercial loans [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment             
Impaired loans with no related allowance, Unpaid Principal balance             
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired             
Impaired loans with a related allowance, Unpaid Principal Balance             
Impaired loans with a related allowance, Related Allowance             
Impaired loans with no related allowance, Interest Income Recognized              
Impaired loans with no related allowance, Average Recorded Investment              
Impaired loans with a related allowance, Average Recorded Investment              
Impaired loans with a related allowance, Interest Income Recognized              
Farmland [Member] | Commercial loans [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment           258
Impaired loans with no related allowance, Unpaid Principal balance           258
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired 744   744     
Impaired loans with a related allowance, Unpaid Principal Balance 744   744     
Impaired loans with a related allowance, Related Allowance 159   159    
Impaired loans with no related allowance, Interest Income Recognized              
Impaired loans with no related allowance, Average Recorded Investment 372 333 508 112  
Impaired loans with a related allowance, Average Recorded Investment 372   372 111  
Impaired loans with a related allowance, Interest Income Recognized            
Home equity lines [Member] | Consumer real estate loans [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment 276   276   368
Impaired loans with no related allowance, Unpaid Principal balance 277   277   378
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired            
Impaired loans with a related allowance, Unpaid Principal Balance            
Impaired loans with a related allowance, Related Allowance            
Impaired loans with no related allowance, Interest Income Recognized    4 20 12  
Impaired loans with no related allowance, Average Recorded Investment 321 398 592 470  
Impaired loans with a related allowance, Average Recorded Investment 125 335 83 145  
Impaired loans with a related allowance, Interest Income Recognized            
Single family owner occupied [Member] | Consumer real estate loans [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment 1,706   1,706   2,428
Impaired loans with no related allowance, Unpaid Principal balance 1,875   1,875   2,508
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired 4,124   4,124   5,529
Impaired loans with a related allowance, Unpaid Principal Balance 4,228   4,228   5,612
Impaired loans with a related allowance, Related Allowance 931   931   1,203
Impaired loans with no related allowance, Interest Income Recognized 38 21 113 26  
Impaired loans with no related allowance, Average Recorded Investment 4,456 1,617 5,727 1,374  
Impaired loans with a related allowance, Average Recorded Investment 3,355 6,064 4,827 5,847  
Impaired loans with a related allowance, Interest Income Recognized 15 49 66 141  
Owner occupied construction [Member] | Consumer real estate loans [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment            
Impaired loans with no related allowance, Unpaid Principal balance            
Impaired loans with no related allowance, Related Allowance            
Impaired loans with no related allowance, Interest Income Recognized        3  
Impaired loans with no related allowance, Average Recorded Investment          80  
Impaired loans with a related allowance, Average Recorded Investment              
Impaired loans with a related allowance, Interest Income Recognized              
Consumer loans [Member] | Consumer and other loans [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment           6
Impaired loans with no related allowance, Unpaid Principal balance           6
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired             
Impaired loans with a related allowance, Unpaid Principal Balance             
Impaired loans with a related allowance, Related Allowance             
Impaired loans with no related allowance, Interest Income Recognized    1    1  
Impaired loans with no related allowance, Average Recorded Investment    66 26 25  
Impaired loans with a related allowance, Average Recorded Investment              
Impaired loans with a related allowance, Interest Income Recognized