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Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Detail) (USD $)
Dec. 31, 2012
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value $ 10,743,229
Less than 12 months Unrealized Loss 52,799
12 months or more Fair Value 570,156
12 months or more Unrealized Loss 79,510
Total Fair Value 11,313,385
Total Unrealized Loss 132,309
Obligations of U.S. Govt Agencies
  
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value 3,840
Less than 12 months Unrealized Loss 320
12 months or more Fair Value 0
12 months or more Unrealized Loss 0
Total Fair Value 3,840
Total Unrealized Loss 320
State and municipal
  
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value 249,595
Less than 12 months Unrealized Loss 403
12 months or more Fair Value 285,606
12 months or more Unrealized Loss 14,394
Total Fair Value 535,201
Total Unrealized Loss 14,797
Corporate trust preferred
  
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value 0
Less than 12 months Unrealized Loss 0
12 months or more Fair Value 284,550
12 months or more Unrealized Loss 65,116
Total Fair Value 284,550
Total Unrealized Loss 65,116
Mortgage-backed
  
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value 10,489,794
Less than 12 months Unrealized Loss 52,076
12 months or more Fair Value 0
12 months or more Unrealized Loss 0
Total Fair Value 10,489,794
Total Unrealized Loss $ 52,076