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Loans Receivable and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
SecurityLoan
Jun. 30, 2012
Jun. 30, 2013
SecurityLoan
Jun. 30, 2012
Dec. 31, 2012
SecurityLoan
Schedule Of Financial Receivables [Line Items]          
Accruing interest $ 1,700,000   $ 1,700,000   $ 2,200,000
Number of aggregate accruing loans current 4   4    
Accrual loans (90 days or more) had been performing 1,700,000   1,700,000    
Loans on nonaccrual status and considered impaired 26,600,000   26,600,000   23,800,000
Recorded additional income 373,000 274,000 679,000 584,000  
Interest collected and recognized as income on impaired loans 96,000 0 220,000 180,000  
Average recorded investment in impaired loans 31,700,000   32,400,000    
Troubled debt restructuring impaired loan 10,694,945   10,694,945   11,635,026
Number of modified troubled debt restructuring loan     7   8
Number of Accruing loans 2   2    
Number of non-accruing loans 5   5    
Aggregating accruing loans 4,700,000   4,700,000    
Aggregating non-accruing loans 6,000,000   6,000,000    
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     P6M    
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 36,016,767   36,016,767   33,383,078
Recorded investment of impaired loans related allowances 2,186,044   2,186,044   968,414
Construction to permanent loans downgraded     4,730,324    
No Related Allowance Recorded [Member]
          
Schedule Of Financial Receivables [Line Items]          
Recorded investment, Total 22.3   22.3   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 6,348,925   6,348,925   219,509
Recorded investment of impaired loans related allowances 1,250,663   1,250,663   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 846,888   846,888   5,519,232
Recorded investment, Total 8,754,261   8,754,261   13,567,175
Recorded investment of impaired loans related allowances 158,247   158,247   83,543
Commercial loan that was a troubled debt restructured         4,400,000
Consumer Home Equity [Member]
          
Schedule Of Financial Receivables [Line Items]          
Troubled debt restructuring impaired loan         564,175
Troubled debt restructured loan upgraded         $ 563,000