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Loans and Allowance for Loan Losses (Troubled Debt Restructured) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
loan
Financing Receivable, Modifications [Line Items]      
Total restructured loans, Recorded Balance $ 19,728 $ 25,780  
Restructured loans, Allowance 937 574  
Loans restructured, Number of Loans Modified     2
Loans restructured, Pre Modification Balance     662
Loans restructured, Post Modification Balance     662
Quarter to Date
      
Financing Receivable, Modifications [Line Items]      
Subsequent defaults, Number of Loans 1    
Subsequent defaults, Amortized Cost 152    
Year to Date
      
Financing Receivable, Modifications [Line Items]      
Subsequent defaults, Number of Loans 3    
Subsequent defaults, Amortized Cost 639    
Term Extension and Renewals
      
Financing Receivable, Modifications [Line Items]      
Loans restructured, Number of Loans Modified     9
Loans restructured, Pre Modification Balance     7,173
Loans restructured, Post Modification Balance     7,073
Construction and Land Development Loans
      
Financing Receivable, Modifications [Line Items]      
Restructured loans with an allowance, Recorded Balance 295 136  
Restructured loans without an allowance, Recorded Balance 2,282 2,725  
Restructured loans, Allowance 16 61  
Loans restructured, Number of Loans Modified     11
Loans restructured, Pre Modification Balance     7,835
Loans restructured, Post Modification Balance     7,735
Construction and Land Development Loans | Interest Rate Modifications
      
Financing Receivable, Modifications [Line Items]      
Loans restructured, Number of Loans Modified     2
Loans restructured, Pre Modification Balance     662
Loans restructured, Post Modification Balance     662
Construction and Land Development Loans | Term Extension and Renewals
      
Financing Receivable, Modifications [Line Items]      
Loans restructured, Number of Loans Modified     2
Loans restructured, Pre Modification Balance     1,004
Loans restructured, Post Modification Balance     949
Other Commercial Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Restructured loans with an allowance, Recorded Balance 4,447 4,018  
Restructured loans without an allowance, Recorded Balance 11,707 17,002  
Restructured loans, Allowance 603 320  
Other Commercial Real Estate Loans | Term Extension and Renewals
      
Financing Receivable, Modifications [Line Items]      
Loans restructured, Number of Loans Modified     5
Loans restructured, Pre Modification Balance     4,188
Loans restructured, Post Modification Balance     4,175
Other Commercial Loans
      
Financing Receivable, Modifications [Line Items]      
Restructured loans with an allowance, Recorded Balance 238 387  
Restructured loans without an allowance, Recorded Balance 92 119  
Restructured loans, Allowance 238 117  
Other Commercial Loans | Quarter to Date
      
Financing Receivable, Modifications [Line Items]      
Subsequent defaults, Number of Loans 0    
Subsequent defaults, Amortized Cost 0    
Other Commercial Loans | Year to Date
      
Financing Receivable, Modifications [Line Items]      
Subsequent defaults, Number of Loans 1    
Subsequent defaults, Amortized Cost 335    
Other Commercial Loans | Term Extension and Renewals
      
Financing Receivable, Modifications [Line Items]      
Loans restructured, Number of Loans Modified     1
Loans restructured, Pre Modification Balance     1,828
Loans restructured, Post Modification Balance     1,797
Other 1-4 Family Residential Loans
      
Financing Receivable, Modifications [Line Items]      
Restructured loans with an allowance, Recorded Balance 198 199  
Restructured loans without an allowance, Recorded Balance 469 1,194  
Restructured loans, Allowance 80 76  
Other 1-4 Family Residential Loans | Quarter to Date
      
Financing Receivable, Modifications [Line Items]      
Subsequent defaults, Number of Loans 1    
Subsequent defaults, Amortized Cost 152    
Other 1-4 Family Residential Loans | Year to Date
      
Financing Receivable, Modifications [Line Items]      
Subsequent defaults, Number of Loans 2    
Subsequent defaults, Amortized Cost 304    
Other 1-4 Family Residential Loans | Term Extension and Renewals
      
Financing Receivable, Modifications [Line Items]      
Loans restructured, Number of Loans Modified     1
Loans restructured, Pre Modification Balance     153
Loans restructured, Post Modification Balance     $ 152