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Loans (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Summary of Loans        
Commercial, Total $ 473,102   $ 460,471  
Real Estate, Total 191,347   189,714  
Consumer, Total 281,710   289,084  
Mortgage warehouse 143,609   251,448  
Total Loans 1,089,768   1,190,717  
Allowance for loan losses (19,565) (18,270) (18,270) (18,882)
Loans, net 1,070,203 1,172,447 1,172,447  
Consumer Loans Auto Financing Receivable [Member]
       
Summary of Loans        
Consumer, Total 139,785   142,149  
Home equity line of credit [Member]
       
Summary of Loans        
Consumer, Total 101,261   104,974  
Working capital and equipment [Member]
       
Summary of Loans        
Commercial, Total 207,901   198,805  
Real estate including agriculture [Member]
       
Summary of Loans        
Commercial, Total 251,470   247,108  
Tax exempt loans receivable [Member]
       
Summary of Loans        
Commercial, Total 4,467   4,579  
Other commercial loans [Member]
       
Summary of Loans        
Commercial, Total 9,264   9,979  
1-4 family [Member]
       
Summary of Loans        
Real Estate, Total 187,692   185,940  
Other [Member]
       
Summary of Loans        
Real Estate, Total 3,655   3,774  
Recreation consumer loans receivable [Member]
       
Summary of Loans        
Consumer, Total 4,908   5,163  
Real estate home improvement loans receivable [Member]
       
Summary of Loans        
Consumer, Total 29,599   29,989  
Unsecured Debt [Member]
       
Summary of Loans        
Consumer, Total 3,759   4,194  
Other consumer loans [Member]
       
Summary of Loans        
Consumer, Total $ 2,398   $ 2,615