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Total Allowance by Loan Segment (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Provision for credit losses | $ 260,000 | $ 100,000 | $ 150,000 | $ 288,000 | $ 150,000 | $ 225,000 | $ 260,000 | $ 250,000 | $ 663,000
Individually evaluated for impairment, Balance in allowance | 1,163,567 |  |  |  |  |  | 1,163,567 |  |
Loans Receivable |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  |  |  | 3,399,516 | 3,307,920 | 3,930,924 | 3,399,516
Provision for credit losses |  |  |  |  |  |  | 260,000 | 250,000 | 663,000
Recoveries |  |  |  |  |  |  | 437,502 | 392,275 | 484,804
Loans charged off |  |  |  |  |  |  | (1,033,403) | (1,265,279) | (616,396)
Balance, end of year | 2,972,019 | 3,307,920 |  | 3,930,924 |  |  | 2,972,019 | 3,307,920 | 3,930,924
Individually evaluated for impairment, Balance in allowance | 1,163,567 | 1,314,777 |  | 2,553,104 |  |  | 1,163,567 | 1,314,777 | 2,553,104
Individually evaluated for impairment, Related loan balance | 5,908,796 | 7,398,293 |  | 10,876,258 |  |  | 5,908,796 | 7,398,293 | 10,876,258
Collectively evaluated for impairment, Balance in allowance | 1,808,452 | 1,993,143 |  | 1,377,820 |  |  | 1,808,452 | 1,993,143 | 1,377,820
Collectively evaluated for impairment, Balance in allowance | 268,918,682 | 246,624,399 |  | 226,847,222 |  |  | 268,918,682 | 246,624,399 | 226,847,222
Loans Receivable | Commercial and Industrial |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  |  |  | 263,251 | 541,916 | 557,169 | 263,251
Provision for credit losses |  |  |  |  |  |  | 46,303 | 29,282 | 295,525
Recoveries |  |  |  |  |  |  | 26,804 | 10,558 | 4,010
Loans charged off |  |  |  |  |  |  | (202,114) | (55,093) | (5,617)
Balance, end of year | 412,909 | 541,916 |  | 557,169 |  |  | 412,909 | 541,916 | 557,169
Individually evaluated for impairment, Balance in allowance | 278,786 | 451,126 |  | 455,735 |  |  | 278,786 | 451,126 | 455,735
Individually evaluated for impairment, Related loan balance | 278,786 | 796,511 |  | 1,248,279 |  |  | 278,786 | 796,511 | 1,248,279
Collectively evaluated for impairment, Balance in allowance | 134,123 | 90,790 |  | 101,434 |  |  | 134,123 | 90,790 | 101,434
Collectively evaluated for impairment, Balance in allowance | 3,893,961 | 4,104,596 |  | 5,944,795 |  |  | 3,893,961 | 4,104,596 | 5,944,795
Loans Receivable | Commercial Real Estate |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  |  |  | 2,108,223 | 1,183,240 | 2,012,962 | 2,108,223
Provision for credit losses |  |  |  |  |  |  | (374,067) | (919,161) | (165,691)
Recoveries |  |  |  |  |  |  | 89,189 | 89,439 | 70,430
Loans charged off |  |  |  |  |  |  |  |  |
Balance, end of year | 898,362 | 1,183,240 |  | 2,012,962 |  |  | 898,362 | 1,183,240 | 2,012,962
Individually evaluated for impairment, Balance in allowance | 550,794 | 807,735 |  | 1,641,711 |  |  | 550,794 | 807,735 | 1,641,711
Individually evaluated for impairment, Related loan balance | 3,364,193 | 4,980,503 |  | 7,538,638 |  |  | 3,364,193 | 4,980,503 | 7,538,638
Collectively evaluated for impairment, Balance in allowance | 347,568 | 375,505 |  | 371,251 |  |  | 347,568 | 375,505 | 371,251
Collectively evaluated for impairment, Balance in allowance | 65,414,415 | 67,898,601 |  | 63,535,256 |  |  | 65,414,415 | 67,898,601 | 63,535,256
Loans Receivable | Consumer and Indirect |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  |  |  | 829,517 | 1,057,531 | 888,614 | 829,517
Provision for credit losses |  |  |  |  |  |  | 468,559 | 357,622 | 256,886
Recoveries |  |  |  |  |  |  | 313,795 | 286,564 | 408,889
Loans charged off |  |  |  |  |  |  | (652,281) | (475,269) | (606,678)
Balance, end of year | 1,187,604 | 1,057,531 |  | 888,614 |  |  | 1,187,604 | 1,057,531 | 888,614
Individually evaluated for impairment, Balance in allowance | 178,657 | 20,000 |  | 44,235 |  |  | 178,657 | 20,000 | 44,235
Individually evaluated for impairment, Related loan balance | 636,174 | 76,251 |  | 125,455 |  |  | 636,174 | 76,251 | 125,455
Collectively evaluated for impairment, Balance in allowance | 1,008,947 | 1,037,531 |  | 844,379 |  |  | 1,008,947 | 1,037,531 | 844,379
Collectively evaluated for impairment, Balance in allowance | 72,594,259 | 66,020,034 |  | 49,992,575 |  |  | 72,594,259 | 66,020,034 | 49,992,575
Loans Receivable | Residential Real Estate |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  |  |  | 196,275 | 392,506 | 595,812 | 196,275
Provision for credit losses |  |  |  |  |  |  | 372,251 | 525,897 | 402,163
Recoveries |  |  |  |  |  |  | 7,714 | 5,714 | 1,475
Loans charged off |  |  |  |  |  |  | (179,008) | (734,917) | (4,101)
Balance, end of year | 593,463 | 392,506 |  | 595,812 |  |  | 593,463 | 392,506 | 595,812
Individually evaluated for impairment, Balance in allowance | 155,330 | 35,916 |  | 411,423 |  |  | 155,330 | 35,916 | 411,423
Individually evaluated for impairment, Related loan balance | 1,629,643 | 1,545,028 |  | 1,963,886 |  |  | 1,629,643 | 1,545,028 | 1,963,886
Collectively evaluated for impairment, Balance in allowance | 438,133 | 356,590 |  | 184,389 |  |  | 438,133 | 356,590 | 184,389
Collectively evaluated for impairment, Balance in allowance | 127,016,047 | 108,601,168 |  | 107,374,596 |  |  | 127,016,047 | 108,601,168 | 107,374,596
Loans Receivable | Unallocated |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  |  |  | 2,250 | 132,727 | (123,633) | 2,250
Provision for credit losses |  |  |  |  |  |  | (253,046) | 256,360 | (125,883)
Recoveries |  |  |  |  |  |  |  |  |
Loans charged off |  |  |  |  |  |  |  |  |
Balance, end of year | (120,319) | 132,727 |  | (123,633) |  |  | (120,319) | 132,727 | (123,633)
Individually evaluated for impairment, Balance in allowance |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Related loan balance |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | (120,319) | 132,727 |  | (123,633) |  |  | (120,319) | 132,727 | (123,633)
Collectively evaluated for impairment, Balance in allowance |  |  |  |  |  |  |  |  |

X
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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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=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually 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=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables 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 (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually 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 (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: 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=28368275&loc=SL6953423-111524 Reference 4: 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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