Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income:
Interest and fees on loans	$ 12,695,520	$ 12,135,221	$ 12,219,130
Interest on debt securities: Taxable	1,345,549	1,366,591	998,238
Interest on debt securities: Tax-exempt	1,240,706	1,055,727	1,110,237
Dividends	72,619	69,343	38,645
Interest on deposits in other banks	62,138	51,995	65,910
Interest on certificates of deposit in other banks	11,795	33,327	42,703
Total interest income	15,428,327	14,712,204	14,474,863
Interest expense:
Deposits	795,850	749,854	882,085
Federal funds purchased	426	258	15
Other short-term borrowings	67,274	169,661	295,034
Long-term debt	453,258	435,686	485,823
Total interest expense	1,316,808	1,355,459	1,662,957
Net interest income	14,111,519	13,356,745	12,811,906
Provision for loan losses	141,300	330,000	420,000
Net interest income after provision for loan losses	13,970,219	13,026,745	12,391,906
Noninterest income:
Service charges on deposit accounts	1,121,240	1,274,726	1,278,221
Income from trust services	245,279	241,131	227,622
Income from brokerage services	420,695	375,699	338,323
Income from insurance services	1,372,872	1,324,183	1,328,532
Income from mortgage banking services	317,970	645,241	939,874
Net gain (loss) on sale or disposition of assets	22,382	88,631	(68,088)
Net gain on sale of securities	3,587	293,508	311,800
Other income	756,152	743,319	734,887
Total noninterest income	4,260,177	4,986,438	5,091,171
Noninterest expense:
Salaries and employee benefits	7,914,155	8,359,019	8,455,375
Occupancy expense	1,120,940	1,060,822	1,025,293
Equipment expense	923,267	896,416	902,312
Data processing expense	1,224,177	1,129,617	1,096,790
Amortization of intangible assets	15,625	44,931	215,700
Other operating expenses	2,831,433	2,878,991	2,650,599
Total noninterest expenses	14,029,597	14,369,796	14,346,069
Income before income taxes	4,200,799	3,643,387	3,137,008
Provision for income taxes	827,164	739,557	364,664
Net income	$ 3,373,635	$ 2,903,830	$ 2,772,344
Basic earnings per share:
Net income	$ 1.32	$ 1.14	$ 1.09
Weighted average shares outstanding	2,547,837	2,547,837	2,547,837
Diluted earnings per share:
Net income	$ 1.32	$ 1.14	$ 1.09
Weighted average shares outstanding	2,547,837	2,547,837	2,547,837