Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Investment securities held to maturity	$ 45,147,800	$ 55,123,073
Allowance for loan losses	3,043,632	3,124,611
Certificates of deposit	$ 100,000	$ 100,000
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	4,293,835	4,293,835
Treasury stock, at cost	$ 1,752,330	$ 1,746,398