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Loans And Allowance - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Loans and Allowance [Line Items]        
Loans and leases receivable, gross $ 254,022,692 $ 237,723,480 $ 234,285,696  
Amount of recorded investment in new troubled debt restructurings, totaled 2,202,268 4,108,209 2,844,177  
Amount of loans on which the accrual of interest has been discontinued, totaled 4,008,665 5,060,693 6,983,004  
Amount of interest that would have been accrued from non performing financial receivable, totaled 273,974 268,407 145,148  
Amount of loans past due 90 days or more and still accruing interest, totaled 1,612,740 18,605 0  
Amount of commercial loan and receivable, outstanding 164,587      
Amount of commercial loan and receivable, specific reserves 46,952      
Amount of commercial real estate loan and receivable, outstanding 1,271,937      
Amount of commercial real estate loan and receivable, specific reserves 371,937      
Balance, beginning of year 3,307,920 3,930,924 3,399,516 3,572,528
Non-performing TDRs
        
Loans and Allowance [Line Items]        
Loans and leases receivable, gross   2,818,295    
Amount of recorded investment in new troubled debt restructurings, totaled 2,202,268   2,844,177  
Amount of interest that would have been accrued from non performing financial receivable, totaled 9,491   1,369,768  
Residential Real Estate
        
Loans and Allowance [Line Items]        
Loans and leases receivable, gross 110,146,196 109,338,482 103,782,644  
Amount of recorded investment in new troubled debt restructurings, totaled 832,500 1,280,423 0  
Balance, beginning of year 392,506 595,812 196,275 162,142
Residential Real Estate | Non-performing TDRs
        
Loans and Allowance [Line Items]        
Loans and leases receivable, gross   0    
Amount of recorded investment in new troubled debt restructurings, totaled 832,500      
Commercial Real Estate
        
Loans and Allowance [Line Items]        
Loans and leases receivable, gross 72,879,104 71,073,894 76,449,631  
Amount of recorded investment in new troubled debt restructurings, totaled 1,369,768 2,818,295 2,808,466  
Balance, beginning of year 1,183,240 2,012,962 2,108,223 2,380,024
Commercial Real Estate | Non-performing TDRs
        
Loans and Allowance [Line Items]        
Loans and leases receivable, gross   2,818,295    
Amount of recorded investment in new troubled debt restructurings, totaled 1,369,768      
Unallocated
        
Loans and Allowance [Line Items]        
Balance, beginning of year 132,727 (123,633) 2,250 (50,000)
Executive Officers Directors and Their Affiliated Interests
        
Loans and Allowance [Line Items]        
Amount of loans additions, totaled 300,085      
Amount of loans repayments, totaled 4,833,581      
Amount of loans outstanding, totaled 354,257 4,887,753 5,109,539  
Installment
        
Loans and Allowance [Line Items]        
Loans and leases receivable, gross 66,096,285 50,118,030 46,860,351  
Collateralized Auto Loans | Installment
        
Loans and Allowance [Line Items]        
Loans and leases receivable, gross $ 47,427,000 $ 31,907,000 $ 30,286,000