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Credit Quality of Loans and Allowance for Loan Losses, Allowance for Loan Losses and Recorded Investment (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for loan losses and recorded investment in loans [Abstract]      
Collectively Evaluated for Impairment $ 6,770 $ 6,743  
Individually Evaluated for Impairment 687 627  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total allowance for loan losses 7,457 7,370 7,276
Loans [Abstract]      
Collectively Evaluated for Impairment 1,026,974 1,034,979  
Individually Evaluated for Impairment 6,631 7,440  
Loans Acquired with Deteriorated Credit Quality 4,254 4,521  
Total loans 1,037,859 1,046,940 [1]  
Commercial, Financial and Agricultural [Member]
     
Allowance for loan losses and recorded investment in loans [Abstract]      
Collectively Evaluated for Impairment 1,115 1,144  
Individually Evaluated for Impairment 467 391  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total allowance for loan losses 1,582 1,535 1,734
Loans [Abstract]      
Collectively Evaluated for Impairment 313,677 313,937  
Individually Evaluated for Impairment 1,648 1,636  
Loans Acquired with Deteriorated Credit Quality 72 82  
Total loans 315,397 315,655  
Real Estate - Construction [Member]
     
Allowance for loan losses and recorded investment in loans [Abstract]      
Collectively Evaluated for Impairment 2,212 2,090  
Individually Evaluated for Impairment 51 57  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total allowance for loan losses 2,263 2,147 1,661
Loans [Abstract]      
Collectively Evaluated for Impairment 81,673 74,398  
Individually Evaluated for Impairment 835 936  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total loans 82,508 75,334  
Commercial Real Estate [Member]
     
Allowance for loan losses and recorded investment in loans [Abstract]      
Collectively Evaluated for Impairment 2,252 2,131  
Individually Evaluated for Impairment 21 35  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total allowance for loan losses 2,273 2,166 2,215
Loans [Abstract]      
Collectively Evaluated for Impairment 399,117 407,489  
Individually Evaluated for Impairment 2,688 2,911  
Loans Acquired with Deteriorated Credit Quality 3,900 3,984  
Total loans 405,705 414,384  
Residential Real Estate [Member]
     
Allowance for loan losses and recorded investment in loans [Abstract]      
Collectively Evaluated for Impairment 827 906  
Individually Evaluated for Impairment 42 30  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total allowance for loan losses 869 936 936
Loans [Abstract]      
Collectively Evaluated for Impairment 136,797 140,776  
Individually Evaluated for Impairment 1,205 1,627  
Loans Acquired with Deteriorated Credit Quality 282 455  
Total loans 138,284 142,858  
Consumer [Member]
     
Allowance for loan losses and recorded investment in loans [Abstract]      
Collectively Evaluated for Impairment 319 429  
Individually Evaluated for Impairment 106 114  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total allowance for loan losses 425 543 710
Loans [Abstract]      
Collectively Evaluated for Impairment 88,643 90,231  
Individually Evaluated for Impairment 255 330  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total loans 88,898 90,561  
Financial Leases [Member]
     
Allowance for loan losses and recorded investment in loans [Abstract]      
Collectively Evaluated for Impairment 42 41  
Individually Evaluated for Impairment 0 0  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total allowance for loan losses 42 41 19
Loans [Abstract]      
Collectively Evaluated for Impairment 4,962 5,769  
Individually Evaluated for Impairment 0 0  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total loans 4,962 5,769  
Other [Member]
     
Allowance for loan losses and recorded investment in loans [Abstract]      
Collectively Evaluated for Impairment 3 2  
Individually Evaluated for Impairment 0 0  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total allowance for loan losses 3 2 1
Loans [Abstract]      
Collectively Evaluated for Impairment 2,105 2,379  
Individually Evaluated for Impairment 0 0  
Loans Acquired with Deteriorated Credit Quality 0 0  
Total loans $ 2,105 $ 2,379  
[1] Derived from audited financial statements