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Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net realized gain on investment $ 803,938 $ 439,326 $ 990,118 $ 574,328
Unrecognized loss (2,153) (2,235) (6,459) (6,705)
Income before Income Taxes 8,916,615 11,378,167 23,713,818 20,503,675
Tax (2,990,000) (3,249,000) (7,647,000) (6,040,000)
Net Income 5,926,615 8,129,167 16,066,818 14,463,675
Reclassification Out Of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net Income 528,098 280,985 638,569 358,502
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized Gains And Losses On Available-For-Sale Securities        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net realized gain on investment 803,938 545,925 976,888 785,517
Other-than-temporary impairments 0 (118,703) 0 (233,941)
Income before Income Taxes 803,938 427,222 976,888 551,576
Tax (274,419) (144,761) (334,054) (188,648)
Net Income 529,519 282,461 642,834 362,928
Reclassification Out Of Accumulated Other Comprehensive Income | Postretirement Benefits Plans        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Prior year service cost 0 0 0 0
Unrecognized loss (2,153) (2,235) (6,459) (6,705)
Income before Income Taxes (2,153) (2,235) (6,459) (6,705)
Tax 732 759 2,194 2,279
Net Income $ (1,421) $ (1,476) $ (4,265) $ (4,426)