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Allowance for Loan Losses and Credit Quality Indicators (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment $ 25,433 $ 23,749
Allowance for Loans Individually Evaluated 6,783 4,997
Loans Collectively Evaluated for Impairment 1,364,589 1,369,432
Allowance for Loans Collectively Evaluated 19,380 21,007
Acquired Impaired Loans Evaluated for Impairment 2,293 2,886
Allowance for Acquired Impaired Loans Evaluated 8 201
Commercial loans [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment 16,419 15,418
Allowance for Loans Individually Evaluated 5,823 3,794
Loans Collectively Evaluated for Impairment 726,122 694,131
Allowance for Loans Collectively Evaluated 12,426 13,757
Acquired Impaired Loans Evaluated for Impairment 1,879 2,491
Allowance for Acquired Impaired Loans Evaluated 8 201
Consumer real estate [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment 9,014 8,325
Allowance for Loans Individually Evaluated 960 1,203
Loans Collectively Evaluated for Impairment 564,974 595,311
Allowance for Loans Collectively Evaluated 6,312 6,508
Acquired Impaired Loans Evaluated for Impairment 414 395
Consumer and other loans [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment   6
Loans Collectively Evaluated for Impairment 73,493 79,990
Allowance for Loans Collectively Evaluated 642 742
Construction commercial [Member] | Commercial loans [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment 12 411
Loans Collectively Evaluated for Impairment 13,298 35,071
Allowance for Loans Collectively Evaluated 491 865
Land development [Member] | Commercial loans [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment   250
Loans Collectively Evaluated for Impairment 6,549 2,652
Allowance for Loans Collectively Evaluated 136 481
Other land loans [Member] | Commercial loans [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment 111 112
Allowance for Loans Individually Evaluated 4 4
Loans Collectively Evaluated for Impairment 26,460 23,123
Allowance for Loans Collectively Evaluated 346 542
Acquired Impaired Loans Evaluated for Impairment   149
Commercial and industrial [Member] | Commercial loans [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment 3,967 3,738
Allowance for Loans Individually Evaluated 3,731 1,847
Loans Collectively Evaluated for Impairment 75,236 87,563
Allowance for Loans Collectively Evaluated 1,333 1,668
Acquired Impaired Loans Evaluated for Impairment 225 638
Allowance for Acquired Impaired Loans Evaluated 8 201
Multi-family residential [Member] | Commercial loans [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment 796 278
Allowance for Loans Individually Evaluated     
Loans Collectively Evaluated for Impairment 80,010 76,772
Allowance for Loans Collectively Evaluated 2,163 1,889
Single family non-owner occupied [Member] | Commercial loans [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment 4,097 3,438
Allowance for Loans Individually Evaluated 441 124
Loans Collectively Evaluated for Impairment 135,446 102,063
Allowance for Loans Collectively Evaluated 2,458 2,836
Acquired Impaired Loans Evaluated for Impairment 1,441 1,242
Non-farm, non-residential [Member] | Commercial loans [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment 7,436 6,933
Allowance for Loans Individually Evaluated 1,647 1,819
Loans Collectively Evaluated for Impairment 350,269 328,610
Allowance for Loans Collectively Evaluated 5,105 5,114
Acquired Impaired Loans Evaluated for Impairment 483 462
Agricultural [Member] | Commercial loans [Member]
    
Investment in loans related to each segment    
Loans Collectively Evaluated for Impairment 1,643 1,374
Allowance for Loans Collectively Evaluated 19 19
Farmland [Member] | Commercial loans [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment   258
Loans Collectively Evaluated for Impairment 37,211 36,903
Allowance for Loans Collectively Evaluated 375 343
Home equity lines [Member] | Consumer real estate [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment 616 368
Allowance for Loans Individually Evaluated 250  
Loans Collectively Evaluated for Impairment 107,236 111,019
Allowance for Loans Collectively Evaluated 1,277 1,365
Single family owner occupied [Member] | Consumer real estate [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment 8,398 7,957
Allowance for Loans Individually Evaluated 710 1,203
Loans Collectively Evaluated for Impairment 427,321 464,715
Allowance for Loans Collectively Evaluated 4,849 4,931
Acquired Impaired Loans Evaluated for Impairment 414 395
Owner occupied construction [Member] | Consumer real estate [Member]
    
Investment in loans related to each segment    
Loans Collectively Evaluated for Impairment 30,417 19,577
Allowance for Loans Collectively Evaluated 186 212
Consumer loans [Member] | Consumer and other loans [Member]
    
Investment in loans related to each segment    
Loans Individually Evaluated for Impairment   6
Loans Collectively Evaluated for Impairment 67,643 67,123
Allowance for Loans Collectively Evaluated 642 742
Other [Member]
    
Investment in loans related to each segment    
Allowance for Loans Collectively Evaluated     
Other [Member] | Consumer and other loans [Member]
    
Investment in loans related to each segment    
Loans Collectively Evaluated for Impairment $ 5,850 $ 12,867