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Allowance for Loan Losses and Credit Quality Indicators (Details 5) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Aging of past due loans by loan class    
30-59 Days Past Due $ 10,630 $ 9,351
60-89 Days Past Due 3,587 3,626
90+ Days Past Due 23,717 13,935
Total Past Due 37,934 26,912
Current Loans 1,503,699 1,369,155
Total Loans 1,541,633 1,396,067
Commercial loans [Member]
    
Aging of past due loans by loan class    
Total Loans 858,122 712,040
Consumer real estate loans [Member]
    
Aging of past due loans by loan class    
Total Loans 601,938 604,031
Consumer and other loans [Member]
    
Aging of past due loans by loan class    
Total Loans 81,573 79,996
Construction, development, and other land [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 134 253
60-89 Days Past Due 6  
90+ Days Past Due 480 987
Total Past Due 620 1,240
Current Loans 61,410 60,528
Total Loans 62,031 61,768
Commercial and industrial [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 464 150
60-89 Days Past Due 346 30
90+ Days Past Due 3,477 3,568
Total Past Due 4,287 3,748
Current Loans 93,135 88,191
Total Loans 97,422 91,939
Multi-family residential [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 152 667
60-89 Days Past Due     
90+ Days Past Due 386 342
Total Past Due 538 1,009
Current Loans 75,218 76,041
Total Loans 75,756 77,050
Single family non-owner occupied [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 882 1,222
60-89 Days Past Due 310 414
90+ Days Past Due 4,106 1,020
Total Past Due 5,298 2,656
Current Loans 130,048 104,087
Total Loans 135,346 106,743
Non-farm, non-residential [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 3,016 837
60-89 Days Past Due 1,278 860
90+ Days Past Due 9,074 2,180
Total Past Due 13,368 3,877
Current Loans 435,991 332,128
Total Loans 449,359 336,005
Agricultural [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due     
60-89 Days Past Due 19 7
90+ Days Past Due 3  
Total Past Due 22 7
Current Loans 1,452 1,367
Total Loans 1,474 1,374
Farmland [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 173 152
60-89 Days Past Due     
90+ Days Past Due    258
Total Past Due 173 410
Current Loans 36,562 36,751
Total Loans 36,735 37,161
Home equity lines [Member] | Consumer real estate loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 613 642
60-89 Days Past Due 239 222
90+ Days Past Due 587 235
Total Past Due 1,439 1,099
Current Loans 110,438 110,288
Total Loans 111,878 111,387
Single family owner occupied [Member] | Consumer real estate loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 4,502 5,230
60-89 Days Past Due 1,334 1,993
90+ Days Past Due 5,366 5,333
Total Past Due 11,202 12,556
Current Loans 463,783 460,511
Total Loans 474,984 473,067
Owner occupied construction [Member] | Consumer real estate loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due     
60-89 Days Past Due    29
90+ Days Past Due 139  
Total Past Due 139 29
Current Loans 14,937 19,548
Total Loans 15,076 19,577
Consumer loans [Member] | Consumer and other loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 694 198
60-89 Days Past Due 55 71
90+ Days Past Due 99 12
Total Past Due 848 281
Current Loans 75,156 66,848
Total Loans 76,003 67,129
Other [Member] | Consumer and other loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due     
60-89 Days Past Due     
90+ Days Past Due     
Total Past Due     
Current Loans 5,569 12,867
Total Loans 5,569 12,867
Covered Loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 1,953  
60-89 Days Past Due 1,274  
90+ Days Past Due 1,736  
Total Past Due 4,963  
Current Loans 217,014  
Total Loans 221,977  
Covered Loans [Member] | Construction, development, and other land [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 905  
60-89 Days Past Due 386  
90+ Days Past Due 602  
Total Past Due 1,893  
Current Loans 26,992  
Total Loans 28,885  
Covered Loans [Member] | Commercial and industrial [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 80  
60-89 Days Past Due 30  
90+ Days Past Due     
Total Past Due 110  
Current Loans 6,866  
Total Loans 6,976  
Covered Loans [Member] | Multi-family residential [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due     
60-89 Days Past Due     
90+ Days Past Due     
Total Past Due     
Current Loans 3,559  
Total Loans 3,559  
Covered Loans [Member] | Single family non-owner occupied [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due     
60-89 Days Past Due     
90+ Days Past Due     
Total Past Due     
Current Loans     
Total Loans     
Covered Loans [Member] | Non-farm, non-residential [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 137  
60-89 Days Past Due 731  
90+ Days Past Due 357  
Total Past Due 1,225  
Current Loans 49,498  
Total Loans 50,723  
Covered Loans [Member] | Agricultural [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 10  
60-89 Days Past Due     
90+ Days Past Due     
Total Past Due 10  
Current Loans 298  
Total Loans 308  
Covered Loans [Member] | Farmland [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due     
60-89 Days Past Due     
90+ Days Past Due     
Total Past Due     
Current Loans 1,334  
Total Loans 1,334  
Covered Loans [Member] | Home equity lines [Member] | Consumer real estate loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 241  
60-89 Days Past Due 49  
90+ Days Past Due 417  
Total Past Due 707  
Current Loans 86,651  
Total Loans 87,358  
Covered Loans [Member] | Single family owner occupied [Member] | Consumer real estate loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 580  
60-89 Days Past Due 78  
90+ Days Past Due 299  
Total Past Due 957  
Current Loans 35,502  
Total Loans 36,459  
Covered Loans [Member] | Owner occupied construction [Member] | Consumer real estate loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due     
60-89 Days Past Due     
90+ Days Past Due 61  
Total Past Due 61  
Current Loans 1,921  
Total Loans 1,982  
Covered Loans [Member] | Consumer loans [Member] | Consumer and other loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due     
60-89 Days Past Due     
90+ Days Past Due     
Total Past Due     
Current Loans 4,393  
Total Loans 4,393  
Covered Loans [Member] | Other [Member] | Consumer and other loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due     
60-89 Days Past Due     
90+ Days Past Due     
Total Past Due     
Current Loans     
Total Loans