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Loans Receivable and Allowance for Loan Losses - Company's Loan Portfolio (Detail) (USD $)
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Noncancelable Obligations Future Minimum Payments Due [Line Items]            
Total Loans $ 452,383,006   $ 464,150,482      
Premiums on purchased loans 203,801   219,649      
Net deferred costs 548,696   439,041      
Allowance for loan losses (5,322,070) (5,717,148) (6,015,636) (6,673,648) (8,460,943) (9,384,672)
Loans receivable, net 447,813,433   458,793,536      
Commercial, Real Estate [Member]
           
Noncancelable Obligations Future Minimum Payments Due [Line Items]            
Total Loans 236,223,829   247,495,321      
Allowance for loan losses (1,953,084) (2,492,111) (3,509,395)     (4,018,746)
Residential Real Estate [Member]
           
Noncancelable Obligations Future Minimum Payments Due [Line Items]            
Total Loans 117,416,181   119,033,025      
Allowance for loan losses (933,961) (746,399) (897,368)     (2,550,588)
Construction [Member]
           
Noncancelable Obligations Future Minimum Payments Due [Line Items]            
Total Loans 3,470,518   4,997,991      
Allowance for loan losses (236,484) (307,198) (311,297)     (867,159)
Construction to Permanent [Member]
           
Noncancelable Obligations Future Minimum Payments Due [Line Items]            
Total Loans 9,904,369   4,851,768      
Allowance for loan losses (23,594) (31,114) (18,720)     (547,333)
Commercial [Member]
           
Noncancelable Obligations Future Minimum Payments Due [Line Items]            
Total Loans 36,278,299   36,428,751      
Allowance for loan losses (1,721,688) (1,846,315) (941,456)     (882,062)
Consumer Home Equity [Member]
           
Noncancelable Obligations Future Minimum Payments Due [Line Items]            
Total Loans 47,097,674   49,180,908      
Consumer Installment [Member]
           
Noncancelable Obligations Future Minimum Payments Due [Line Items]            
Total Loans $ 1,992,136   $ 2,162,718