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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 12,184,336	$ 13,036,246	$ 11,483,015	$ 12,856,509
Other comprehensive income before reclassifications	2,021,107	(1,412,635)	2,814,046	(1,228,408)
Amounts reclassified from accumulated other comprehensive income	14,101	(599,814)	(77,517)	(604,304)
Other comprehensive income (loss)	2,035,208	(2,012,449)	2,736,529	(1,832,712)
Ending balance	14,219,544	11,023,797	14,219,544	11,023,797
Unrealized Gains And Losses On Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	12,297,587	13,112,930	11,597,741	12,934,497
Other comprehensive income before reclassifications	2,021,107	(1,412,635)	2,814,046	(1,228,408)
Amounts reclassified from accumulated other comprehensive income	12,626	(601,118)	(80,467)	(606,912)
Other comprehensive income (loss)	2,033,733	(2,013,753)	2,733,579	(1,835,320)
Ending balance	14,331,320	11,099,177	14,331,320	11,099,177
Postretirement Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(113,251)	(76,684)	(114,726)	(77,988)
Other comprehensive income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	1,475	1,304	2,950	2,608
Other comprehensive income (loss)	1,475	1,304	2,950	2,608
Ending balance	$ (111,776)	$ (75,380)	$ (111,776)	$ (75,380)