CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 19,262	$ 15,609	$ 19,626
Other comprehensive income (loss):
Unrealized holding gains (losses) on securities available for sale	10,415	8,053	(1,382)
Reclassification adjustment gains realized in net income	0	19	0
Net unrealized gains (losses)	10,415	8,072	(1,382)
Tax effect	(2,656)	(2,058)	353
Net of tax amount	7,759	6,014	(1,029)
Change in funded status of defined benefit pension plan and other benefit plans:
Net gain (loss) arising during the period	506	(626)	(711)
Reclassification adjustment for amortization of prior service benefit	(220)	(220)	(220)
Prior service credit	0	0	0
Reclassification adjustment for partial pension settlement loss included in pension expense	0	0	828
Reclassification adjustment for amortization of net actuarial losses	300	312	318
Total before tax effect	586	(534)	215
Tax effect	(145)	132	(55)
Net of tax amount	441	(402)	160
Total other comprehensive income (loss)	8,200	5,612	(869)
Comprehensive income	$ 27,462	$ 21,221	$ 18,757