Consolidated Statement of Changes in Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statement of Changes in Comprehensive Income [Abstract]
Net income	$ 25,103,000	$ 19,490,000	$ 18,034,000
Securities available for sale
Unrealized holding gain (loss) during the period	5,074,000	4,156,000	(913,000)
Income tax (benefit)	1,066,000	873,000	(193,000)
Securities available for sale	4,008,000	3,283,000	(720,000)
Reclassification adjustment for (gains) losses included in income	(305,000)	(24,000)	19,000
Income tax (benefit)	(65,000)	(4,000)	4,000
Reclassification	(240,000)	(20,000)	15,000
Unrealized loss on interest rate swap	(11,000)	0	0
Income tax (benefit)	(2,000)	0	0
Other comprehensive loss on interest rate swap	(9,000)	0	0
Change in unrecognized pension costs	(688,000)	36,000	229,000
Income tax (benefit)	(145,000)	7,000	48,000
Other comprehensive gain (loss) gain on unrecognized pension costs	(543,000)	29,000	181,000
Other comprehensive income (loss)	3,216,000	3,292,000	(524,000)
Comprehensive income	$ 28,319,000	$ 22,782,000	$ 17,510,000