Accumulated Other Comprehensive Income Balances Of Each Component Of Accumulated Other Comprehensive Income, Net Of Tax (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 11,347,404	$ 8,818,430	$ 7,509,165
Other comprehensive income before reclassifications	1,843,011	2,656,145	1,977,408
Amounts reclassified from accumulated other comprehensive income	(333,906)	(127,171)	(668,143)
Other comprehensive income	1,509,105	2,528,974	1,309,265
Ending balance	12,856,509	11,347,404	8,818,430
Unrealized Gains And Losses On Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	11,395,757	8,920,884	7,563,541
Other comprehensive income before reclassifications	1,874,111	2,605,184	2,032,134
Amounts reclassified from accumulated other comprehensive income	(335,371)	(130,311)	(674,791)
Other comprehensive income	1,538,740	2,474,873	1,357,343
Ending balance	12,934,497	11,395,757	8,920,884
Postretirement Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(48,353)	(102,454)	(54,376)
Other comprehensive income before reclassifications	(31,100)	50,961	(54,726)
Amounts reclassified from accumulated other comprehensive income	1,465	3,140	6,648
Other comprehensive income	(29,635)	54,101	(48,078)
Ending balance	$ (77,988)	$ (48,353)	$ (102,454)