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Retirement Agreements and Other Postretirement Benefit Plan Changes in Amounts Related to Accumulated Other Comprehensive Income, Pre-tax (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year $ 173,812 $ 118,150  
Unrecognized prior service cost 0 (4,390) $ (2,217)
Amortization of loss, net (8,941) (3,514) 0
Actuarial loss 566 63,566 47,121
Balance at end of year $ 165,437 $ 173,812 $ 118,150