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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

X
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 168, 169, 170 -IssueDate 2006-05-01 -Chapter 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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