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Impaired Financing Receivables (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Impaired [Line Items]      
Recorded Investment with specific reserves $ 4,435,425 $ 9,036,824 $ 7,591,726
Unpaid Principal Balance with specific reserves 5,035,425 9,636,824 8,191,726
Interest Income Recognized with specific reserves 146,945 331,752 470,136
Specific Reserve with specific reserves 1,314,777 2,553,104 1,924,769
Average Recorded Investment with specific reserves 4,479,960 9,126,560 7,525,785
Recorded Investment with no specific reserve 2,962,868 1,839,434 3,867,722
Unpaid Principal Balance with no specific reserve 3,182,303 1,839,434 3,867,722
Interest Income Recognized with no specific reserve 75,050 78,122 124,693
Average Recorded Investment with no specific reserve 4,235,843 1,599,873 5,004,005
Residential
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment with specific reserves 180,416 1,703,322 427,204
Unpaid Principal Balance with specific reserves 180,416 1,703,322 427,204
Interest Income Recognized with specific reserves 11,838 62,320 19,326
Specific Reserve with specific reserves 35,916 411,423 32,146
Average Recorded Investment with specific reserves 182,019 1,708,158 431,575
Recorded Investment with no specific reserve 1,364,612 260,564 230,947
Unpaid Principal Balance with no specific reserve 1,812,535 260,564 230,947
Interest Income Recognized with no specific reserve 75,050 7,149 12,204
Average Recorded Investment with no specific reserve 1,794,861 245,128 231,090
Commercial
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment with specific reserves 3,610,735 6,502,986 6,605,317
Unpaid Principal Balance with specific reserves 4,210,735 7,102,986 7,205,317
Interest Income Recognized with specific reserves 99,079 218,564 417,554
Specific Reserve with specific reserves 807,735 1,641,711 1,691,887
Average Recorded Investment with specific reserves 3,642,095 6,559,298 6,513,982
Recorded Investment with no specific reserve 1,369,768 1,035,652 2,394,073
Unpaid Principal Balance with no specific reserve 1,369,768 1,035,652 2,394,073
Interest Income Recognized with no specific reserve 0 50,036 67,082
Average Recorded Investment with no specific reserve 2,440,982 1,051,139 3,285,175
Consumer
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment with specific reserves 75,513 100,455 77,358
Unpaid Principal Balance with specific reserves 75,513 100,455 77,358
Interest Income Recognized with specific reserves 7,759 10,423 2,605
Specific Reserve with specific reserves 20,000 44,235 20,000
Average Recorded Investment with specific reserves 76,098 103,733 77,358
Recorded Investment with no specific reserve 738 25,000 389,217
Unpaid Principal Balance with no specific reserve 0 25,000 389,217
Interest Income Recognized with no specific reserve 0 0 0
Average Recorded Investment with no specific reserve 0 0 513,901
Installment
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment with specific reserves 147,301 0 0
Unpaid Principal Balance with specific reserves 147,301 0 0
Interest Income Recognized with specific reserves 7,806 0 0
Specific Reserve with specific reserves 29,666 0 0
Average Recorded Investment with specific reserves 147,574 0 0
Recorded Investment with no specific reserve 227,750 264,868 0
Unpaid Principal Balance with no specific reserve 0 264,868 0
Interest Income Recognized with no specific reserve 0 0 0
Average Recorded Investment with no specific reserve 0 0 0
Home Equity
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment with specific reserves 0 0 0
Unpaid Principal Balance with specific reserves 0 0 0
Interest Income Recognized with specific reserves 0 0 0
Specific Reserve with specific reserves 0 0 0
Average Recorded Investment with specific reserves 0 0 0
Recorded Investment with no specific reserve 0 0 0
Unpaid Principal Balance with no specific reserve 0 0 0
Interest Income Recognized with no specific reserve 0 0 0
Average Recorded Investment with no specific reserve 0 0 0
Commercial
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment with specific reserves 421,460 730,061 481,847
Unpaid Principal Balance with specific reserves 421,460 730,061 481,847
Interest Income Recognized with specific reserves 20,463 40,445 30,651
Specific Reserve with specific reserves 421,460 455,735 180,736
Average Recorded Investment with specific reserves 432,174 755,371 502,870
Recorded Investment with no specific reserve 0 253,350 853,485
Unpaid Principal Balance with no specific reserve 0 253,350 853,485
Interest Income Recognized with no specific reserve 0 20,937 45,407
Average Recorded Investment with no specific reserve $ 0 $ 303,606 $ 973,839