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Loans and Allowance for Loan Losses (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
standard_deviations
Sep. 30, 2012
loan
standard_deviations
Sep. 30, 2011
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held for investment, unearned income $ 1,074 $ 1,074   $ 2,045
Allowance for loan losses, historical period used for loss rates 5 years   13 years  
Standard deviations applied to analysis on estimating loan loss rates 2 2    
Credit commitments available for construction and land development restructured loans       356
Loans restructured during the period   0    
Commercial and Consumer | Federal Reserve Bank
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans pledged as collateral 9,914 9,914   18,005
Individual Real Estate-Secured Loans
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Transfer of mortgage loans from held-for-sale to loans held for investment   6,576 454  
Individual Real Estate-Secured Loans | Federal Home Loan Bank Advances
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans pledged as collateral 157,556 157,556   216,201
Commercial Real Estate
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan participations purchased during period, held for investment   3,261 821  
Adjustment to historical loan loss rate due to environmental factors (as a percentage) 0.10% 0.10%   0.10%
Adjustment to average loss rate due change in historical period used in calculation (as a percentage)       0.27%
Agricultural Loans
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan participations purchased during period, held for investment   $ 4,849    
Commerical Agricultural and Municipal
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Adjustment to historical loan loss rate due to environmental factors (as a percentage)       0.50%
Other Commercial Loans
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Adjustment to historical loan loss rate due to environmental factors (as a percentage) 0.25% 0.25%