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Allowance for Loan Losses and Credit Quality Indicators (Details 5) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Aging of past due loans by loan class    
30-59 Days Past Due $ 9,538 $ 9,351
60-89 Days Past Due 3,068 3,626
90+ Days Past Due 17,945 13,935
Total Past Due 30,551 26,912
Current Loans 1,537,761 1,369,155
Total Loans 1,568,312 1,396,067
Commercial loans [Member]
    
Aging of past due loans by loan class    
Total Loans 873,971 712,040
Consumer real estate [Member]
    
Aging of past due loans by loan class    
Total Loans 612,710 604,031
Consumer and other loans [Member]
    
Aging of past due loans by loan class    
Total Loans 81,631 79,996
Construction commercial [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 347 48
60-89 Days Past Due 72  
90+ Days Past Due 1,188 411
Total Past Due 1,607 459
Current Loans 19,270 35,023
Total Loans 20,877 35,482
Land development [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 48 297
Total Past Due 48 297
Current Loans 6,501 2,605
Total Loans 6,549 2,902
Other land loans [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 65 205
60-89 Days Past Due     
90+ Days Past Due 216 279
Total Past Due 281 484
Current Loans 26,290 22,900
Total Loans 26,571 23,384
Commercial and industrial [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 1,069 150
60-89 Days Past Due 101 30
90+ Days Past Due 1,316 3,568
Total Past Due 2,486 3,748
Current Loans 96,878 88,191
Total Loans 99,364 91,939
Multi-family residential [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 751 667
60-89 Days Past Due 476  
90+ Days Past Due 401 342
Total Past Due 1,628 1,009
Current Loans 84,412 76,041
Total Loans 86,040 77,050
Single family non-owner occupied [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 674 1,222
60-89 Days Past Due 404 414
90+ Days Past Due 3,306 1,020
Total Past Due 4,384 2,656
Current Loans 136,300 104,087
Total Loans 140,684 106,743
Non-farm, non-residential [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 2,038 837
60-89 Days Past Due 670 860
90+ Days Past Due 5,794 2,180
Total Past Due 8,502 3,877
Current Loans 445,318 332,128
Total Loans 453,820 336,005
Agricultural [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 34  
60-89 Days Past Due    7
90+ Days Past Due     
Total Past Due 34 7
Current Loans 1,609 1,367
Total Loans 1,643 1,374
Farmland [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 313 152
60-89 Days Past Due     
90+ Days Past Due    258
Total Past Due 313 410
Current Loans 38,110 36,751
Total Loans 38,423 37,161
Home equity lines [Member] | Consumer real estate [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 1,148 642
60-89 Days Past Due 468 222
90+ Days Past Due 461 235
Total Past Due 2,077 1,099
Current Loans 113,766 110,288
Total Loans 115,843 111,387
Single family owner occupied [Member] | Consumer real estate [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 2,784 5,230
60-89 Days Past Due 727 1,993
90+ Days Past Due 5,146 5,333
Total Past Due 8,657 12,556
Current Loans 457,793 460,511
Total Loans 466,450 473,067
Owner occupied construction [Member] | Consumer real estate [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 19  
60-89 Days Past Due 129 29
90+ Days Past Due 33  
Total Past Due 181 29
Current Loans 30,236 19,548
Total Loans 30,417 19,577
Consumer loans [Member] | Consumer and other loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 296 198
60-89 Days Past Due 21 71
90+ Days Past Due 36 12
Total Past Due 353 281
Current Loans 75,428 66,848
Total Loans 75,781 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 5,850 12,867
Total Loans 5,850 12,867
Covered Loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 2,085  
60-89 Days Past Due 644  
90+ Days Past Due 19,363  
Total Past Due 22,092  
Current Loans 216,685  
Total Loans 238,777  
Covered Loans [Member] | Construction commercial [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 893  
60-89 Days Past Due 323  
90+ Days Past Due 8,216  
Total Past Due 9,432  
Current Loans 8,338  
Total Loans 17,770  
Covered Loans [Member] | Land development [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] | Other land loans [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] | Commercial and industrial [Member] | Commercial loans [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due     
60-89 Days Past Due 73  
90+ Days Past Due 255  
Total Past Due 328  
Current Loans 7,335  
Total Loans 7,663  
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 563  
Total Past Due 563  
Current Loans 3,143  
Total Loans 3,706  
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 117  
60-89 Days Past Due 61  
90+ Days Past Due 5,506  
Total Past Due 5,684  
Current Loans 61,607  
Total Loans 66,751  
Covered Loans [Member] | Agricultural [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 307  
Total Loans 307  
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 241  
Total Past Due 241  
Current Loans 1,104  
Total Loans 1,345  
Covered Loans [Member] | Home equity lines [Member] | Consumer real estate [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 436  
60-89 Days Past Due 26  
90+ Days Past Due 192  
Total Past Due 654  
Current Loans 87,854  
Total Loans 88,508  
Covered Loans [Member] | Single family owner occupied [Member] | Consumer real estate [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 472  
60-89 Days Past Due 161  
90+ Days Past Due 3,904  
Total Past Due 4,537  
Current Loans 41,154  
Total Loans 45,691  
Covered Loans [Member] | Owner occupied construction [Member] | Consumer real estate [Member]
    
Aging of past due loans by loan class    
30-59 Days Past Due 167  
60-89 Days Past Due     
90+ Days Past Due 393  
Total Past Due 560  
Current Loans 1,942  
Total Loans 2,502  
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 93  
Total Past Due 93  
Current Loans 4,441  
Total Loans 4,534  
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