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Past Due Financing Receivables (Detail) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current $ 246,531,094 $ 231,173,214 $ 224,273,601
30-89Days PastDue 1,870,193 1,470,968 3,029,091
90 Days or More and Still Accruing 1,612,740 18,605 0
Non-accrual 4,008,665 5,060,693 6,983,004
Total 254,022,692 237,723,480 234,285,696
Commercial and Industrial
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 4,678,297 7,134,672 5,735,517
30-89Days PastDue 205,524 38,116 97,999
90 Days or More and Still Accruing 0 0 0
Non-accrual 17,286 20,286 1,359,554
Total 4,901,107 7,193,074 7,193,070
Commercial Real Estate
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 68,879,791 66,589,634 70,675,983
30-89Days PastDue 0 0 1,251,402
90 Days or More and Still Accruing 1,353,993 0 0
Non-accrual 2,645,320 4,484,260 4,522,246
Total 72,879,104 71,073,894 76,449,631
Consumer and Indirect
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 64,427,468 48,744,945 45,155,344
30-89Days PastDue 1,431,624 1,298,261 1,580,082
90 Days or More and Still Accruing 0 0 0
Non-accrual 237,193 74,824 124,925
Total 66,096,285 50,118,030 46,860,351
Residential Real Estate
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 108,545,538 108,703,963 102,706,757
30-89Days PastDue 233,045 134,591 99,608
90 Days or More and Still Accruing 258,747 18,605 0
Non-accrual 1,108,866 481,323 976,279
Total $ 110,146,196 $ 109,338,482 $ 103,782,644