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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Unrealized holding gains (losses) arising during the period, deferred taxes (benefits) $ 472,938 $ 2,008,578 $ (13,677)
Reclassification adjustment for impairment loss included in net income, deferred tax benefits 0 8,722 104,293
Reclassification adjustment for gains included in net income, deferred taxes $ 65,653 $ 134,696 $ 69,671