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Loans Receivable and Allowance for Loan Losses - Total Troubled Debt Restructured Loans (Detail) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
SecurityLoan
Dec. 31, 2012
SecurityLoan
Financing Receivable, Modifications [Line Items]    
Number of Loans 4 8
Troubled debt restructured loan amount $ 4,596,250 $ 11,635,026
Commercial, Real Estate [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 2
Troubled debt restructured loan amount 1,880,000 4,255,658
Residential Real Estate [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 3
Troubled debt restructured loan amount 500,000 5,519,232
Construction to Permanent [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 2 1
Troubled debt restructured loan amount 2,216,250 1,258,710
Commercial [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans   1
Troubled debt restructured loan amount   37,251
Consumer Home Equity [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans   1
Troubled debt restructured loan amount   564,175
Accrual of Loans [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 1
Troubled debt restructured loan amount 1,003,299 564,175
Accrual of Loans [Member] | Commercial, Real Estate [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans      
Troubled debt restructured loan amount      
Accrual of Loans [Member] | Residential Real Estate [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans      
Troubled debt restructured loan amount      
Accrual of Loans [Member] | Construction to Permanent [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1   
Troubled debt restructured loan amount 1,003,299   
Accrual of Loans [Member] | Commercial [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans     
Troubled debt restructured loan amount     
Accrual of Loans [Member] | Consumer Home Equity [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans   1
Troubled debt restructured loan amount   564,175
Non-Accrual Loans [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 3 7
Troubled debt restructured loan amount 3,592,951 11,070,851
Non-Accrual Loans [Member] | Commercial, Real Estate [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 2
Troubled debt restructured loan amount 1,880,000 4,255,658
Non-Accrual Loans [Member] | Residential Real Estate [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 3
Troubled debt restructured loan amount 500,000 5,519,232
Non-Accrual Loans [Member] | Construction to Permanent [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 1
Troubled debt restructured loan amount 1,212,951 1,258,710
Non-Accrual Loans [Member] | Commercial [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans   1
Troubled debt restructured loan amount   37,251
Non-Accrual Loans [Member] | Consumer Home Equity [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans     
Troubled debt restructured loan amount