Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 6,547	$ 4,813	$ 17,198	$ 13,293
Other comprehensive (loss) income:
Unrealized income arising during the period on available-for-sale securities, net of income taxes impact, respectively		90	190	419	3,188
Reclassification adjustment for net gain on sales of available-for-sale securities included in net income, net of income taxes impact, respectively	[1]	(118)	(37)	(310)	(56)
Change in defined benefit plans, net of income taxes impact, respectively	[2]	(101)	(231)	(741)	(545)
Reclassification adjustment for other activity related to benefit plans, net of income taxes respectively	[3]	(5)	(17)
Reclassification adjustment for settlement losses (gains) and other activity related to benefit plans, net of income taxes, respectively	[3]			5	(78)
Total other comprehensive (loss) income		(134)	(95)	(627)	2,509
Total comprehensive income		$ 6,413	$ 4,718	$ 16,571	$ 15,802

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

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

[3] The reclassification adjustment for 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 total noninterest income.  Please reference Note 11 – Defined Benefit Plans, for more information.