CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest and fee income
Loans, including fees	$ 12,851,900	$ 11,795,303	$ 11,263,048
Taxable securities	1,297,636	1,376,441	1,045,592
Tax-exempt securities	1,007,438	1,012,638	1,059,883
Other	138,623	45,566	49,731
Total interest and fee income	15,295,597	14,229,948	13,418,254
Interest expense
Deposits	378,733	401,463	408,266
Short-term borrowings	7	932	681
Total interest expense	378,740	402,395	408,947
Net interest income	14,916,857	13,827,553	13,009,307
Provision for loan losses	570,000	192,500	82,500
Net interest income after provision for loan losses	14,346,857	13,635,053	12,926,807
Other income
Service charges, fees and commissions	1,061,349	991,007	921,638
Mortgage banking income	1,387,740	1,605,676	1,315,020
Gain on sale of securities	380,904	423,832	312,577
Other non-interest income	31,090	29,443	29,466
Total other income	2,861,083	3,049,958	2,578,701
Other expense
Salaries and employee benefits	6,087,929	5,859,203	5,466,446
Net occupancy expense	1,528,048	1,480,606	1,473,700
Net other real estate owned expenses	16,691	5,284	16,440
Other operating expenses	2,639,776	2,168,382	2,152,236
Total other expenses	10,272,444	9,513,475	9,108,822
Income before income tax expense	6,935,496	7,171,536	6,396,686
Income tax expense	1,688,433	2,287,248	1,997,866
Net income	$ 5,247,063	$ 4,884,288	$ 4,398,820
Weighted average shares outstanding
Basic (in shares)	4,935,349	4,912,499	4,907,208
Diluted (in shares)	5,054,114	5,067,085	5,032,211
Basic income per common share (in dollars per share)	$ 1.06	$ 0.99	$ 0.90
Diluted income per common share (in dollars per share)	$ 1.04	$ 0.96	$ 0.87