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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 10,377,980 $ 8,688,485 $ 8,818,430 $ 7,509,165
Other comprehensive income before reclassifications (1,081,096) (306,199) 489,148 998,284
Amounts reclassified from accumulated other comprehensive income (35,883) (34,470) (46,577) (159,633)
Other comprehensive (loss) income (1,116,979) (340,669) 442,571 838,651
Ending balance 9,261,001 8,347,816 9,261,001 8,347,816
Unrealized Gains And Losses On Available-For-Sale Securities
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 10,479,645 8,741,199 8,920,883 7,563,541
Other comprehensive income before reclassifications (1,081,096) (306,199) 489,148 998,284
Amounts reclassified from accumulated other comprehensive income (36,670) (36,133) (48,152) (162,958)
Other comprehensive (loss) income (1,117,766) (342,332) 440,996 835,326
Ending balance 9,361,879 8,398,867 9,361,879 8,398,867
Postretirement Benefits Plans
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (101,665) (52,714) (102,453) (54,376)
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income 787 1,663 1,575 3,325
Other comprehensive (loss) income 787 1,663 1,575 3,325
Ending balance $ (100,878) $ (51,051) $ (100,878) $ (51,051)