Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income:
Interest and fees on loans	$ 13,812,000	$ 13,265,000	$ 12,970,000
Interest and dividends on securities:
U. S. Treasuries	1,077,000	1,410,000	1,602,000
U.S. Government agencies	477,000	471,000	531,000
Mortgage-backed securities	3,208,000	2,633,000	1,320,000
Collateralized mortgage obligations	192,000
States and political subdivisions	1,745,000	1,744,000	1,634,000
Other investments	71,000	22,000	26,000
Interest on balances due from depository institutions	346,000	205,000	420,000
Total interest income	20,928,000	19,750,000	18,503,000
Interest expense:
Deposits	2,998,000	2,354,000	1,373,000
Federal funds purchased and securities sold under agreements to repurchase		10,000	3,000
Borrowings from Federal Home Loan Bank	248,000	294,000	47,000
Total interest expense	3,246,000	2,658,000	1,423,000
Net interest income	17,682,000	17,092,000	17,080,000
Provision for allowance for loan losses		122,000	116,000
Net interest income after provision for allowance for loan losses	17,682,000	16,970,000	16,964,000
Non-interest income:
Gain on liquidation, sales and calls of securities	147,000		134,000
Gain on sale of other investments		16,995
Income (loss) from other investments	(168,000)	(274,000)	42,000
Increase in cash surrender value of life insurance	440,000	455,000	458,000
Gain from death benefits from life insurance			429,000
Other income	532,000	460,000	481,000
Total non-interest income	6,367,000	6,103,000	6,965,000
Non-interest expense:
Salaries and employee benefits	10,701,000	10,891,000	10,949,000
Net occupancy	2,187,000	2,004,000	2,121,000
Equipment rentals, depreciation and maintenance	3,084,000	3,134,000	3,006,000
Other expense	6,398,000	6,451,000	6,175,000
Total non-interest expense	22,370,000	22,480,000	22,251,000
Income before income taxes	1,679,000	593,000	1,678,000
Income tax benefit	0	(36,000)	(1,080,000)
Net income	$ 1,679,000	$ 629,000	$ 2,758,000
Basic and diluted earnings per share (in dollars per share)	$ 0.34	$ 0.13	$ 0.54
Dividends declared per share (in dollars per share)	$ 0.03	$ 0.02	$ 0.01
Trust Department Income and Fees [Member]
Non-interest income:
Revenue from contract with customer	$ 1,614,000	$ 1,708,000	$ 1,689,000
Service Charges on Deposit Accounts [Member]
Non-interest income:
Revenue from contract with customer	$ 3,802,000	$ 3,737,000	$ 3,732,000