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Loans Receivable and Allowance for Loan Losses - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2013 SecurityLoan | Sep. 30, 2012 | Jun. 30, 2012 | Sep. 30, 2013 SecurityLoan | Sep. 30, 2012 | Dec. 31, 2012 SecurityLoan
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Accruing interest | $ 1,811,566 |  |  | $ 1,811,566 |  | $ 2,234,297
Number of aggregate accruing loans current | 4 |  |  | 4 |  |
Accrual loans (90 days or more) had been performing | 1,600,000 |  |  | 1,600,000 |  |
Accrual loans (90 days or more) had been performing subsequently paid off | 214,000 |  |  | 214,000 |  |
Loans on nonaccrual status and considered impaired | 20,700,000 |  |  | 20,700,000 |  | 23,800,000
Recorded additional income | 281,000 | 521,000 |  | 960,000 | 1,100,000 |
Interest collected and recognized as income on impaired loans | 627,000 | 76,000 |  | 847,000 | 514,000 |
Average recorded investment in impaired loans | 32,200,000 |  |  | 32,300,000 |  |
Troubled debt restructuring impaired loan | 4,596,250 |  |  | 4,596,250 |  | 11,635,026
Number of modified troubled debt restructuring loan |  |  |  | 4 |  | 8
Number of Accruing loans | 1 |  |  | 1 |  |
Number of non-accruing loans | 3 |  |  | 3 |  |
Aggregating accruing loans | 1,000,000 |  |  | 1,000,000 |  |
Aggregating non-accruing loans | 3,600,000 |  |  | 3,600,000 |  |
Creditworthiness extends credit |  |  |  | 75.00% |  |
Borrowers' creditworthiness |  |  |  | 80.00% |  |
Construction loans, the maximum loan-to-value |  |  |  | 65.00% |  |
Construction loans are short-term loans |  |  |  | 18 months |  |
Real Estate and Accumulated Depreciation, Date of Construction |  |  |  | Four months |  |
Reduction in the allowance for loan losses |  |  | 1,100,000 |  |  |
Performance under loan terms |  |  |  | Within six months |  |
Delinquency status, "Open-end" credits are charged-off |  |  |  | 180 days |  |
Delinquent and "Closed-end" credits are charged-off |  |  |  | 120 days |  |
Consumer installment loans are charged off no later |  |  |  | 90 days |  |
Recorded investment, Total | 30,486,740 |  |  | 30,486,740 |  | 33,383,078
Recorded investment of impaired loans related allowances | 3,156,881 |  |  | 3,156,881 |  | 968,414
Construction to permanent loans downgraded |  |  |  | 4,730,324 |  |
No Related Allowance Recorded [Member] |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Recorded investment, Total | 20,100,000 |  |  | 20,100,000 |  | 25,000,000
Construction to Permanent Real Estate Financing Receivable Loan One [Member] |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Construction to permanent loans downgraded |  |  |  | 3,700,000 |  |
Construction to Permanent Real Estate Financing Receivable Loan Two [Member] |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Construction to permanent loans downgraded |  |  |  | 1,000,000 |  |
Commercial [Member] |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Troubled debt restructuring impaired loan |  |  |  |  |  | 37,251
Recorded investment, Total | 6,109,493 |  |  | 6,109,493 |  | 219,509
Recorded investment of impaired loans related allowances | 2,200,000 |  |  | 2,200,000 |  | 33,280
Commercial loan that was a troubled debt restructured |  |  |  | 37,000 |  |
Residential Real Estate [Member] |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Troubled debt restructuring impaired loan | 500,000 |  |  | 500,000 |  | 5,519,232
Recorded investment, Total | 8,733,016 |  |  | 8,733,016 |  | 13,567,175
Recorded investment of impaired loans related allowances | 325,690 |  |  | 325,690 |  | 83,543
Commercial loan that was a troubled debt restructured |  |  |  | 4,400,000 |  |
Troubled debt restructured loan upgraded |  |  |  | 347,000 |  |
Consumer Home Equity [Member] |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Troubled debt restructuring impaired loan |  |  |  |  |  | 564,175
Troubled debt restructured loan upgraded |  |  |  | 563,000 |  |
Commercial Real Estate Construction Financing Receivable [Member] |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Commercial loan that was a troubled debt restructured |  |  |  | $ 2,000,000 |  |

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