Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income:
Interest and fees on loans	$ 14,796,649	$ 12,695,520	$ 12,135,221
Interest on debt securities:  Taxable	1,170,259	1,345,549	1,366,591
Interest on debt securities:  Tax-exempt	1,253,064	1,240,706	1,055,727
Dividends	89,840	72,619	69,343
Interest on deposits in other banks	103,244	62,138	51,995
Interest on certificates of deposit in other banks	52	11,795	33,327
Total interest income	17,413,108	15,428,327	14,712,204
Interest expense:
Deposits	935,291	795,850	749,854
Federal funds purchased	10	426	258
Other short-term borrowings	103,567	67,274	169,661
Long-term debt	573,225	453,258	435,686
Total interest expense	1,612,093	1,316,808	1,355,459
Net interest income	15,801,015	14,111,519	13,356,745
Provision for loan losses	160,000	141,300	330,000
Net interest income after provision for loan losses	15,641,015	13,970,219	13,026,745
Noninterest income:
Service charges on deposit accounts	1,086,268	1,121,240	1,274,726
Income from trust services	209,755	245,279	241,131
Income from brokerage services	342,051	420,695	375,699
Income from insurance services	1,477,663	1,372,872	1,324,183
Income from mortgage banking services	354,627	317,970	645,241
Net gain on sale or disposition of assets	38,165	22,382	88,631
Net gain on sale of securities	168,919	3,587	293,508
Other income	781,811	756,152	743,319
Total noninterest income	4,459,259	4,260,177	4,986,438
Noninterest expense:
Salaries and employee benefits	8,765,865	7,914,155	8,359,019
Occupancy expense	1,140,600	1,120,940	1,060,822
Equipment expense	860,935	923,267	896,416
Data processing expense	1,367,569	1,224,177	1,129,617
Amortization of intangible assets	15,625	15,625	44,931
Other operating expenses	2,763,227	2,831,433	2,878,991
Total noninterest expenses	14,913,821	14,029,597	14,369,796
Income before income taxes	5,186,453	4,200,799	3,643,387
Provision for income taxes	1,152,476	827,164	739,557
Net income	$ 4,033,977	$ 3,373,635	$ 2,903,830
Basic earnings per share:
Net income	$ 1.58	$ 1.32	$ 1.14
Weighted average shares outstanding	2,547,778	2,547,837	2,547,837
Diluted earnings per share:
Net income	$ 1.58	$ 1.32	$ 1.14
Weighted average shares outstanding	2,547,778	2,547,837	2,547,837