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Loan Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2013
SecurityLoan
Dec. 31, 2012
SecurityLoan
Dec. 31, 2011
Financing Receivable, Impaired [Line Items]        
Sale of residential loans   $ 10,500,000 $ 97,000,000  
Cash purchase price on sale of residential loans   10,700,000 98,500,000  
Net book value of bank's assets   101.50% 101.50%  
Accruing interest   866,000 2,200,000  
Loans on nonaccrual status and considered impaired   12,300,000 23,800,000  
Non-accrual loans (90 days or more) had been performing      1,667,000  
Renewed loan   2 4  
Accrual loans (90 days or more) had been performing subsequently paid off     567,000  
Number of modified troubled debt restructuring loan   2 8  
Troubled debt restructured loan amount   2,188,387 11,635,026  
Number of Accruing loans   1 1  
Number of non-accruing loans   1 7  
Aggregating accruing loans   991,000 500,000  
Aggregating non-accruing loans   1,200,000 11,100,000  
Commitments to advance additional funds under troubled debt restructured loans   0 0  
Non-accrual additional income recorded   1,200,000 1,500,000 2,300,000
Interest collected and recognized as income on non-accrual loans   774,000 231,000 465,000
Average recorded investment in impaired loans   30,800,000 35,000,000 49,800,000
Creditworthiness extends credit   75.00%    
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   4 months    
Reduction in the allowance for loan losses 1,100,000      
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    
Performance under loan terms   6 months    
Loans past due still accruing interest   866,000 2,200,000  
Current loans for interest payment   841,000    
Current loans for interest payment within 60 days   25,000    
Non-accrual loans (over 30 days but under 60 days) had been performing     567,000  
Recorded Investment, Total   21,993,398 33,383,078  
Related Allowance, Total   1,890,737 968,414  
Construction to permanent loans downgraded   4,730,324 14,036,050  
Troubled debt restructured loans reclassified     4  
Permanent troubled debt restructured loans     4,900,000  
Troubled debt restructured other than loans     1,100,000  
Upgraded amount of commercial real estate loan     4,700,000  
Troubled debt restructuring residential loan     364,000  
Additional troubled debt restructured loans     500,000  
Construction [Member]
        
Financing Receivable, Impaired [Line Items]        
Recorded Investment, Total   260,000 1,862,038  
Related Allowance, Total   260,000 120,616  
Troubled debt restructured loan upgraded     1,200,000  
Commercial Real Estate [Member]
        
Financing Receivable, Impaired [Line Items]        
Troubled debt restructured loan amount     4,255,658  
Recorded Investment, Total   7,767,223 15,909,103  
Related Allowance, Total   31,097 728,607  
Troubled debt restructured loan upgraded     234,000  
Troubled debt restructured loan amounts (due to forbearance agreement)     37,000  
Residential Real Estate [Member]
        
Financing Receivable, Impaired [Line Items]        
Troubled debt restructured loan amount     5,519,232  
Recorded Investment, Total   6,024,266 13,567,175  
Related Allowance, Total   97,829 83,543  
Construction to permanent loans downgraded     8,529,624  
Commercial loan that was a troubled debt restructured   4,400,000    
Troubled debt restructured loan upgraded   347,000 2,800,000  
Charged off loan   500,000    
Consumer Home Equity [Member]
        
Financing Receivable, Impaired [Line Items]        
Troubled debt restructured loan amount     564,175  
Construction to permanent loans downgraded     564,175  
Troubled debt restructured loan upgraded   563,000    
Troubled debt restructured loan amounts (due to forbearance agreement)     564,000  
No Related Allowance Recorded [Member]
        
Financing Receivable, Impaired [Line Items]        
Recorded Investment, Total   14,500,000 25,000,000  
Loan Current Interest Payment [Member]
        
Financing Receivable, Impaired [Line Items]        
Accruing interest   841,000    
Loan Current Interest Payment Within Sixty Days [Member]
        
Financing Receivable, Impaired [Line Items]        
Accruing interest   25,000    
Construction to Permanent Real Estate Financing Receivable Loan One [Member]
        
Financing Receivable, Impaired [Line Items]        
Construction to permanent loans downgraded   3,700,000    
Construction to Permanent Real Estate Financing Receivable Loan Two [Member]
        
Financing Receivable, Impaired [Line Items]        
Construction to permanent loans downgraded   1,000,000    
Commercial [Member]
        
Financing Receivable, Impaired [Line Items]        
Troubled debt restructured loan amount     37,251  
Recorded Investment, Total   6,151,799 219,509  
Related Allowance, Total   1,500,000 33,280  
Construction to permanent loans downgraded     37,251  
Commercial loan that was a troubled debt restructured   37,000    
Commercial Real Estate Construction Financing Receivable [Member]
        
Financing Receivable, Impaired [Line Items]        
Commercial loan that was a troubled debt restructured   $ 3,900,000