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Loans and Allowance for Loan Losses (Credit Quality Indicator) (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Deferred Income $ (3,600,000) $ 600,000  
Loans held for investment 1,177,035,000 1,217,535,000  
Servicing Assets, Unconsolidated Loans Serviced, Unpaid Principal Balance 65,100,000 2,000,000 493,700,000
Substandard or Doubtful [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 60,600,000 63,600,000  
Pass [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 952,705,000 910,650,000  
Special Mention [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 71,786,000 130,677,000  
Substandard [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 151,396,000 174,795,000  
Doubtful [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 1,148,000 1,413,000  
Commercial and agricultural [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 79,704,000 95,089,000  
Commercial and agricultural [Member] | Pass [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 69,003,000 77,305,000  
Commercial and agricultural [Member] | Special Mention [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 3,447,000 7,373,000  
Commercial and agricultural [Member] | Substandard [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 6,953,000 9,921,000  
Commercial and agricultural [Member] | Doubtful [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 301,000 490,000  
Real estate - construction [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 58,414,000 92,806,000  
Real estate - construction [Member] | Pass [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 40,117,000 53,105,000  
Real estate - construction [Member] | Special Mention [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 2,031,000 5,797,000  
Real estate - construction [Member] | Substandard [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 16,266,000 33,886,000  
Real estate - construction [Member] | Doubtful [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 0 18,000  
Real estate - mortgage, 1-4 family residential [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 553,538,000 453,725,000  
Real estate - mortgage, 1-4 family residential [Member] | Pass [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 504,819,000 385,022,000  
Real estate - mortgage, 1-4 family residential [Member] | Special Mention [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 15,855,000 25,864,000  
Real estate - mortgage, 1-4 family residential [Member] | Substandard [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 32,625,000 42,630,000  
Real estate - mortgage, 1-4 family residential [Member] | Doubtful [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 239,000 209,000  
Real estate - mortgage, commercial [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 441,836,000 531,383,000  
Real estate - mortgage, commercial [Member] | Pass [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 296,271,000 351,731,000  
Real estate - mortgage, commercial [Member] | Special Mention [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 50,275,000 91,364,000  
Real estate - mortgage, commercial [Member] | Substandard [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 95,126,000 87,971,000  
Real estate - mortgage, commercial [Member] | Doubtful [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 164,000 317,000  
Consumer [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 43,543,000 44,532,000  
Consumer [Member] | Pass [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 42,495,000 43,487,000  
Consumer [Member] | Special Mention [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 178,000 279,000  
Consumer [Member] | Substandard [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment 426,000 387,000  
Consumer [Member] | Doubtful [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment $ 444,000 $ 379,000