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Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net realized gain on investment $ 768,436 $ (116,163) $ 268,294
Unrecognized prior service credit (cost) 0 (4,390) (2,217)
Unrecognized loss (8,941) (3,514) 0
Income before Income Taxes 28,131,452 17,777,053 13,488,498
Tax (8,616,000) (5,228,000) (3,816,000)
Net income 19,515,452 12,549,053 9,672,498
Reclassification Out Of Accumulated Other Comprehensive Income      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net income 479,215 (23,776) 333,906
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 972,672 718,837 518,279
Impairments of other assets and investments (233,941) (751,059) (14,542)
Income before Income Taxes 738,731 (32,222) 503,737
Tax (253,616) 13,662 (168,366)
Net income 485,115 (18,560) 335,371
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) 0 (4,390) (2,217)
Unrecognized loss (8,941) (3,514) 0
Income before Income Taxes [1] (8,941) (7,904) (2,217)
Tax 3,041 2,688 752
Net income $ (5,900) $ (5,216) $ (1,465)
[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.