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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

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