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Total Allowance by Loan Segment (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]                              
Balance, beginning of year       $ 3,930,924       $ 3,399,516       $ 3,572,528 $ 3,930,924 $ 3,399,516 $ 3,572,528
Provision for credit losses 100,000 150,000 0 0 288,000 150,000 0 225,000 0 300,000 450,000 300,000 250,000 663,000 1,050,000
Recoveries                         392,275 484,804 638,998
Loans charged off                         (1,265,279) (616,396) (1,862,010)
Balance, end of year 3,307,920       3,930,924       3,399,516       3,307,920 3,930,924 3,399,516
Balance in allowance 1,314,777       2,553,104       1,924,769       1,314,777 2,553,104 1,924,769
Related loan balance 7,398,293       10,876,258       11,459,448       7,398,293 10,876,258 11,459,448
Balance in allowance 1,993,143       1,377,820       1,474,747       1,993,143 1,377,820 1,474,747
Related loan balance 246,624,399       226,847,222       222,826,248       246,624,399 226,847,222 222,826,248
Commercial and Industrial
                              
Financing Receivable, Allowance for Credit Losses [Line Items]                              
Balance, beginning of year       557,169       263,251       237,461 557,169 263,251 237,461
Provision for credit losses                         29,282 295,525 (7,822)
Recoveries                         10,558 4,010 45,731
Loans charged off                         (55,093) (5,617) (12,119)
Balance, end of year 541,916       557,169       263,251       541,916 557,169 263,251
Balance in allowance 451,126       455,735       180,736       451,126 455,735 180,736
Related loan balance 796,511       1,248,279       1,335,332       796,511 1,248,279 1,335,332
Balance in allowance 90,790       101,434       82,515       90,790 101,434 82,515
Related loan balance 4,104,596       5,944,795       5,857,738       4,104,596 5,944,795 5,857,738
Commercial Real Estate
                              
Financing Receivable, Allowance for Credit Losses [Line Items]                              
Balance, beginning of year       2,012,962       2,108,223       2,380,024 2,012,962 2,108,223 2,380,024
Provision for credit losses                         (919,161) (165,691) 542,416
Recoveries                         89,439 70,430 10,593
Loans charged off                         0 0 (824,810)
Balance, end of year 1,183,240       2,012,962       2,108,223       1,183,240 2,012,962 2,108,223
Balance in allowance 807,735       1,641,711       1,691,887       807,735 1,641,711 1,691,887
Related loan balance 4,980,503       7,538,638       8,999,390       4,980,503 7,538,638 8,999,390
Balance in allowance 375,505       371,251       416,336       375,505 371,251 416,336
Related loan balance 67,898,601       63,535,256       67,450,241       67,898,601 63,535,256 67,450,241
Consumer and Indirect
                              
Financing Receivable, Allowance for Credit Losses [Line Items]                              
Balance, beginning of year       888,614       829,517       842,901 888,614 829,517 842,901
Provision for credit losses                         357,622 256,886 448,197
Recoveries                         286,564 408,889 497,479
Loans charged off                         (475,269) (606,678) (959,060)
Balance, end of year 1,057,531       888,614       829,517       1,057,531 888,614 829,517
Balance in allowance 20,000       44,235       20,000       20,000 44,235 20,000
Related loan balance 76,251       125,455       466,575       76,251 125,455 466,575
Balance in allowance 1,037,531       844,379       809,517       1,037,531 844,379 809,517
Related loan balance 66,020,034       49,992,575       46,393,776       66,020,034 49,992,575 46,393,776
Residential Real Estate
                              
Financing Receivable, Allowance for Credit Losses [Line Items]                              
Balance, beginning of year       595,812       196,275       162,142 595,812 196,275 162,142
Provision for credit losses                         525,897 402,163 14,959
Recoveries                         5,714 1,475 85,195
Loans charged off                         (734,917) (4,101) (66,021)
Balance, end of year 392,506       595,812       196,275       392,506 595,812 196,275
Balance in allowance 35,916       411,423       32,146       35,916 411,423 32,146
Related loan balance 1,545,028       1,963,886       658,151       1,545,028 1,963,886 658,151
Balance in allowance 356,590       184,389       164,129       356,590 184,389 164,129
Related loan balance 108,601,168       107,374,596       103,124,493       108,601,168 107,374,596 103,124,493
Unallocated
                              
Financing Receivable, Allowance for Credit Losses [Line Items]                              
Balance, beginning of year       (123,633)       2,250       (50,000) (123,633) 2,250 (50,000)
Provision for credit losses                         256,360 (125,883) 52,250
Recoveries                         0 0 0
Loans charged off                         0 0 0
Balance, end of year 132,727       (123,633)       2,250       132,727 (123,633) 2,250
Balance in allowance 0       0       0       0 0 0
Related loan balance 0       0       0       0 0 0
Balance in allowance 132,727       (123,633)       2,250       132,727 (123,633) 2,250
Related loan balance $ 0       $ 0       $ 0       $ 0 $ 0 $ 0