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Major Income Classifications Included in Other Income Under Non Interest Income on Income Statement (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Component of Other Income, Nonoperating [Line Items]      
Other income $ 1,399,209 $ 1,324,130 $ 1,212,534
BOLI Insurance
     
Component of Other Income, Nonoperating [Line Items]      
Other income 567,440 636,657 552,913
Mortgage loan origination fees
     
Component of Other Income, Nonoperating [Line Items]      
Other income 486,136 354,407 434,734
Other income
     
Component of Other Income, Nonoperating [Line Items]      
Other income $ 345,633 $ 333,066 $ 224,887