Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Interest and fees on loans	$ 18,762,728	$ 16,299,091	$ 14,796,649
Interest on debt securities: Taxable	1,363,123	1,286,473	1,170,259
Interest on debt securities: Tax-exempt	1,090,871	1,228,479	1,253,064
Dividends	144,856	102,360	89,840
Interest on deposits in other banks	484,724	195,032	103,244
Interest on certificates of deposit in other banks	47,870	34,879	52
Total interest income	21,894,172	19,146,314	17,413,108
Interest expense:
Deposits	2,383,524	1,153,609	935,291
Federal funds purchased	1,097	1,068	10
Other short-term borrowings	395,989	224,144	103,567
Long-term debt	541,804	523,344	573,225
Total interest expense	3,322,414	1,902,165	1,612,093
Net interest income	18,571,758	17,244,149	15,801,015
Provision for loan losses	829,500	300,000	160,000
Net interest income after provision for loan losses	17,742,258	16,944,149	15,641,015
Noninterest income:
Service charges on deposit accounts	1,015,498	1,005,270	1,086,268
Income from trust services	234,649	218,657	209,755
Income from brokerage services	399,278	362,416	342,051
Income from insurance services	1,603,557	1,523,309	1,477,663
Income from mortgage banking services	2,475	155,053	354,627
Net gain (loss) on sale or disposition of assets	(79,529)	(9,022)	38,165
Net gain (loss) on sale of securities	(165,369)	186,610	168,919
Net gain on extinguishment of debt	317,832	0	0
Other income	878,340	870,229	781,811
Total noninterest income	4,206,731	4,312,522	4,459,259
Noninterest expense:
Salaries and employee benefits	9,724,826	9,250,777	8,765,865
Occupancy expense	1,194,552	1,124,028	1,140,600
Equipment expense	933,485	850,376	860,935
Data processing expense	1,445,215	1,513,630	1,367,569
Amortization of intangible assets	15,625	15,625	15,625
Other operating expenses	3,319,751	3,074,843	2,763,227
Total noninterest expenses	16,633,454	15,829,279	14,913,821
Income before income taxes	5,315,535	5,427,392	5,186,453
Provision for income taxes	668,416	1,619,900	1,152,476
Net income	$ 4,647,119	$ 3,807,492	$ 4,033,977
Basic earnings per share:
Net income	$ 1.83	$ 1.49	$ 1.58
Weighted average shares outstanding	2,545,565	2,547,421	2,547,778
Diluted earnings per share:
Net income	$ 1.83	$ 1.49	$ 1.58
Weighted average shares outstanding	2,545,565	2,547,422	2,547,778