Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 29,319	$ 26,209	$ 17,701
Other comprehensive income (loss):
Unrealized (losses) gains arising during the period on available for sale securities, net of income taxes impact, respectively	[1]	(190)	494	4,598
Reclassification adjustment for net gain on sales of available-for-sale securities included in net income, net of income taxes impact, respectively	[1],[2]	(62)	(369)	(1,484)
Change in defined benefit plans, net of income taxes impact, respectively	[1],[3]	511	(503)	(296)
Reclassification adjustment for settlement gains and activity related to benefit plans, net of income taxes impact, respectively	[1],[4]	(44)	(22)	(97)
Total other comprehensive income (loss)		215	(400)	2,721
Total comprehensive income		$ 29,534	$ 25,809	$ 20,422

[1] The income tax impacts of the components of other comprehensive income are calculated using the 21 percent statutory tax rate for 2021, 2020 and 2019.

[2] Amounts are included in net gain on sales of investment securities on the Consolidated Statements of Income as a separate component within total noninterest income.

[3] The change in defined benefit plans consists primarily of unrecognized actuarial (losses) gains on defined benefit plans during the period.

[4] The reclassification adjustment for defined benefit plans includes settlement gains, amortization of prior service costs, and amortization of net gain or loss. Amounts are included in other income on the Consolidated Statements of Income within the total noninterest income.  Please reference Note 15, Postretirement Benefit Plans, to the consolidated financial statements for more information.