Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest income:
Interest and fees on loans	$ 14,821,000	$ 12,945,000	$ 11,135,000
Interest and dividends on securities:
U. S. Treasuries	7,108,000	6,560,000	3,173,000
Mortgage-backed securities	2,397,000	3,621,000	2,586,000
Collateralized mortgage obligations	3,040,000	3,495,000	1,919,000
States and political subdivisions	3,808,000	4,278,000	4,460,000
Other investments	144,000	105,000	22,000
Interest on balances due from depository institutions	1,776,000	1,625,000	413,000
Total interest income	33,094,000	32,629,000	23,708,000
Interest expense:
Deposits	7,637,000	5,746,000	1,985,000
Borrowings	2,006,000	409,000	173,000
Total interest expense	9,643,000	6,155,000	2,158,000
Net interest income	23,451,000	26,474,000	21,550,000
Provision for (reduction of) credit losses	(162,000)	(272,000)	80,000
Net interest income after provision for (reduction of) credit losses	23,613,000	26,746,000	21,470,000
Non-interest income:
Increase in cash surrender value of life insurance	532,000	485,000	445,000
Gain (loss) on sale of property, plant and equipment, net	9,000	30,000	0
Other income	813,000	788,000	994,000
Total non-interest income	7,014,000	6,894,000	6,895,000
Non-interest expense:
Salaries and employee benefits	10,499,000	11,144,000	11,341,000
Net occupancy	2,185,000	2,087,000	1,755,000
Equipment rentals, depreciation and maintenance	3,003,000	2,774,000	2,905,000
Other expense	6,560,000	6,348,000	5,854,000
Total non-interest expense	22,247,000	22,353,000	21,855,000
Income before income taxes	8,380,000	11,287,000	6,510,000
Income tax (benefit) expense	(13,323,000)	2,121,000	(2,431,000)
Net income	$ 21,703,000	$ 9,166,000	$ 8,941,000
Basic earnings per share (in dollars per share)	$ 4.66	$ 1.96	$ 1.91
Diluted earnings per share (in dollars per share)	4.66	1.96	1.91
Dividends declared per share (in dollars per share)	$ 0.44	$ 0.53	$ 0.19
Trust department income and fees
Non-interest income:
Revenue from Contract with Customer, Including Assessed Tax	$ 2,482,000	$ 2,352,000	$ 2,001,000
Service charges on deposit accounts
Non-interest income:
Revenue from Contract with Customer, Including Assessed Tax	$ 3,178,000	$ 3,239,000	$ 3,455,000