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Allowance for Loan Losses and Credit Quality Indicators (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 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 $ 9,065   $ 9,065   $ 6,935
Impaired loans with no related allowance, Unpaid Principal balance 9,294   9,294   7,107
Impaired loans acquired 16,376   16,376   17,221
Impaired loans with a related allowance, Unpaid Principal Balance 16,863   16,863   17,505
Impaired loans with a related allowance, Related Allowance 6,791   6,791   5,198
Total impaired loans, Recorded Investment 25,441   25,441   24,156
Total impaired loans, Unpaid Principal Balance 26,157   26,157   24,612
Total impaired loans, Related Allowance 6,791   6,791   5,198
Impaired loans with no related allowance, Interest Income Recognized 59 44 105 60  
Impaired loans with no related allowance, Average Recorded Investment 9,468 14,258 11,893 13,411  
Impaired loans with a related allowance, Average Recorded Investment 16,435 13,546 16,893 12,203  
Impaired loans with a related allowance, Interest Income Recognized 256 101 404 168  
Total impaired loans, Average Recorded Investment 25,903 27,804 28,786 25,614  
Total impaired loans, Interest Income Recognized 315 145 509 228  
Construction commercial [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 12   12   411
Impaired loans with no related allowance, Unpaid Principal balance 12   12   411
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 11 481 30 322  
Impaired loans with a related allowance, Average Recorded Investment    269    135  
Impaired loans with a related allowance, Interest Income Recognized            
Land development [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           250
Impaired loans with no related allowance, Unpaid Principal balance           250
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    916    458  
Impaired loans with a related allowance, Average Recorded Investment              
Impaired loans with a related allowance, Interest Income Recognized              
Other land loans [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 111   111   112
Impaired loans with a related allowance, Unpaid Principal Balance 111   111   112
Impaired loans with a related allowance, Related Allowance 4   4   4
Impaired loans with no related allowance, Interest Income Recognized         1  
Impaired loans with no related allowance, Average Recorded Investment    2,291    1,491  
Impaired loans with a related allowance, Average Recorded Investment 111 113 111 113  
Impaired loans with a related allowance, Interest Income Recognized    2 1 3  
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 61   61   114
Impaired loans with no related allowance, Unpaid Principal balance 66   66   127
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired 3,914   3,914   4,031
Impaired loans with a related allowance, Unpaid Principal Balance 3,936   3,936   4,069
Impaired loans with a related allowance, Related Allowance 3,739   3,739   2,048
Impaired loans with no related allowance, Interest Income Recognized 5   5    
Impaired loans with no related allowance, Average Recorded Investment 67 4,015 77 4,097  
Impaired loans with a related allowance, Average Recorded Investment 3,922 651 3,973 651  
Impaired loans with a related allowance, Interest Income Recognized 72 8 72 8  
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 796   796   278
Impaired loans with no related allowance, Unpaid Principal balance 801   801   278
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 1 4 14  
Impaired loans with no related allowance, Average Recorded Investment 879 1,357 1,196 1,578  
Impaired loans with a related allowance, Average Recorded Investment    786    644  
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 1,202   1,202   1,206
Impaired loans with no related allowance, Unpaid Principal balance 1,248   1,248   1,244
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired 2,895   2,895   2,232
Impaired loans with a related allowance, Unpaid Principal Balance 2,914   2,914   2,232
Impaired loans with a related allowance, Related Allowance 441   441   124
Impaired loans with no related allowance, Interest Income Recognized 8 19 17 19  
Impaired loans with no related allowance, Average Recorded Investment 1,405 1,158 1,813 1,263  
Impaired loans with a related allowance, Average Recorded Investment 2,888 2,263 2,910 2,389  
Impaired loans with a related allowance, Interest Income Recognized 11 27 42 54  
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 816   816   1,616
Impaired loans with no related allowance, Unpaid Principal balance 856   856   1,647
Impaired loans with no related allowance, Related Allowance             
Impaired loans acquired 6,620   6,620   5,317
Impaired loans with a related allowance, Unpaid Principal Balance 6,966   6,966   5,480
Impaired loans with a related allowance, Related Allowance 1,647   1,647   1,819
Impaired loans with no related allowance, Interest Income Recognized 7 10 17 10  
Impaired loans with no related allowance, Average Recorded Investment 886 1,676 1,119 2,322  
Impaired loans with a related allowance, Average Recorded Investment 6,683 3,052 6,952 2,322  
Impaired loans with a related allowance, Interest Income Recognized 145 8 236 11  
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 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    333    166  
Impaired loans with a related allowance, Interest Income Recognized            
Home equity lines [Member] | Consumer real estate [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment 366   366   368
Impaired loans with no related allowance, Unpaid Principal balance 385   385   378
Impaired loans acquired 250   250    
Impaired loans with a related allowance, Unpaid Principal Balance 250   250    
Impaired loans with a related allowance, Related Allowance 250   250    
Impaired loans with no related allowance, Interest Income Recognized 8 5 14 8  
Impaired loans with no related allowance, Average Recorded Investment 378 644 503 506  
Impaired loans with a related allowance, Average Recorded Investment 250   250 49  
Impaired loans with a related allowance, Interest Income Recognized            
Single family owner occupied [Member] | Consumer real estate [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Recorded Investment 5,812   5,812   2,428
Impaired loans with no related allowance, Unpaid Principal balance 5,926   5,926   2,508
Impaired loans acquired 2,586   2,586   5,529
Impaired loans with a related allowance, Unpaid Principal Balance 2,686   2,686   5,612
Impaired loans with a related allowance, Related Allowance 710   710   1,203
Impaired loans with no related allowance, Interest Income Recognized 27 6 48 5  
Impaired loans with no related allowance, Average Recorded Investment 5,842 1,479 7,155 1,250  
Impaired loans with a related allowance, Average Recorded Investment 2,581 6,079 2,697 5,734  
Impaired loans with a related allowance, Interest Income Recognized 28 56 53 92  
Owner occupied construction [Member] | Consumer real estate [Member]
         
Recorded investment in loans considered to be impaired and related information on those impaired loans          
Impaired loans with no related allowance, Interest Income Recognized   3   3  
Impaired loans with no related allowance, Average Recorded Investment    241    121  
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 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         3  
Impaired loans with a related allowance, Average Recorded Investment              
Impaired loans with a related allowance, Interest Income Recognized