CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 4,901,825	$ 5,247,063	$ 4,884,288
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	193,298	189,188	196,827
Gain on sale of securities	(45,820)	(380,904)	(423,832)
Loss on sale of other real estate	1,477	13,450
Valuation and other adjustments to other real estate owned	86,464
Provision for loan losses	55,000	570,000	192,500
Stock-based compensation expense	71,701	76,529	78,987
Deferred income taxes	276,362	(750,254)	4,748
Net amortization of unearned discounts on investment securities	381,079	250,755	109,311
Origination of mortgage loans held for sale	(55,791,625)	(76,032,671)	(91,053,923)
Proceeds from sale of mortgage loans held for sale	58,084,112	77,466,700	92,558,765
(Increase) decrease in accrued interest receivable and other assets	(78,328)	(63,949)	391,043
Increase (decrease) in accrued interest payable and other liabilities	46,412	(543,083)	176,898
Net cash provided by operating activities	8,181,957	6,042,824	7,115,612
Cash flows from investing activities:
Proceeds from calls and maturities of investment securities available for sale	4,713,870	9,630,804	2,315,000
Proceeds from sale of available for sale securities	20,231,265	36,218,087	16,564,118
Purchase of investment securities available for sale	(44,944,586)	(48,239,241)	(25,389,485)
Proceeds from sale of other real estate	89,355	85,001
Net increase in loans	(9,726,576)	(18,089,620)	(8,712,885)
Purchase of premises, equipment and leasehold improvements, net	(141,199)	(196,584)	(133,632)
Net cash used by investing activities	(29,777,871)	(20,591,553)	(15,356,884)
Cash flows from financing activities:
Net increase in deposit accounts	30,365,449	13,804,239	36,299,585
Net decrease increase in short-term borrowings			(6,980,681)
Dividends paid	(2,832,489)	(2,613,715)	(2,380,062)
Stock options exercised	340,843	405,749	122,946
Cash in lieu of fractional shares			(4,778)
Net cash provided by financing activities	27,873,803	11,596,273	27,057,010
Net increase (decrease) in cash and cash equivalents	6,277,889	(2,952,456)	18,815,738
Cash and cash equivalents at beginning of year	26,242,330	29,194,786	10,379,048
Cash and cash equivalents at end of year	32,520,219	26,242,330	29,194,786
Cash paid during the year for:
Interest	379,302	400,531	419,004
Income taxes	2,496,047	2,320,830	2,196,000
Supplemental disclosure for non-cash investing and financing activity:
Change in unrealized gain (loss) on securities available for sale, net of income taxes	(276,879)	(1,599,658)	(250,473)
Change in dividends payable	53,340	54,706	59,178
Loans transferred to other real estate owned	90,832		$ 186,210
Reclassification of tax effects stranded accumulated other comprehensive income due to tax reform	$ 187,692