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Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net realized gain on investment $ (116,163) $ 268,294 $ 195,800
Unrecognized prior service credit (cost) (4,390) (2,217) 1,518
Unrecognized loss (3,514) 0 (6,293)
Income before Income Taxes 17,777,053 13,488,498 21,542,738
Tax (5,228,000) (3,816,000) (6,746,000)
Net income 12,549,053 9,672,498 14,796,738
Reclassification Out Of Accumulated Other Comprehensive Income      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net income (23,776) 333,906 127,171
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 718,837 518,279 229,869
Impairments of other assets and investments (751,059) (14,542) (34,070)
Income before Income Taxes (32,222) 503,737 195,799
Tax 13,662 (168,366) (65,488)
Net income (18,560) 335,371 130,311
Reclassification Out Of Accumulated Other Comprehensive Income | Postretirement Benefits Plans      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Unrecognized prior service credit (cost) (4,390) (2,217) 1,518
Unrecognized loss (3,514) 0 (6,293)
Income before Income Taxes [1] (7,904) (2,217) (4,775)
Tax 2,688 752 1,635
Net income $ (5,216) $ (1,465) $ (3,140)
[1] These accumulated other comprehensive income components are not reclassified to net income in their entirety in the same reporting period. The amounts are presented within salaries, employee benefits and payroll taxes on the Consolidated Statements of Income as amortized. Amortization related to postretirement benefit plans is included in the computation of net periodic pension costs, as discussed in Note 10.