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Accumulated Other Comprehensive Income Balances Of Each Component Of Accumulated Other Comprehensive Income, Net Of Tax (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 9,261,001 $ 8,347,816 $ 8,818,430 $ 7,509,165
Other comprehensive income before reclassifications 730,005 1,405,803 1,219,153 2,404,087
Amounts reclassified from accumulated other comprehensive income (171,585) (63,552) (218,162) (223,185)
Other comprehensive income 558,420 1,342,251 1,000,991 2,180,902
Ending balance 9,819,421 9,690,067 9,819,421 9,690,067
Unrealized Gains And Losses On Available-For-Sale Securities
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 9,361,879 8,398,867 8,920,883 7,563,541
Other comprehensive income before reclassifications 730,005 1,405,803 1,219,153 2,404,087
Amounts reclassified from accumulated other comprehensive income (172,363) (65,214) (220,515) (228,172)
Other comprehensive income 557,642 1,340,589 998,638 2,175,915
Ending balance 9,919,521 9,739,456 9,919,521 9,739,456
Postretirement Benefits Plans
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (100,878) (51,051) (102,453) (54,376)
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income 778 1,662 2,353 4,987
Other comprehensive income 778 1,662 2,353 4,987
Ending balance $ (100,100) $ (49,389) $ (100,100) $ (49,389)