Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022		Jun. 30, 2021		Jun. 30, 2022		Jun. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 12,252		$ 9,613		$ 23,606		$ 18,925
Other comprehensive (loss) income :
Unrealized (loss) income arising during the period on available-for-sale securities, net of income taxes impact, respectively	(4,812)		21		(10,042)		22
Change in defined benefit plans, net of income taxes impact, respectively			(302)	[1]	127	[2]	298	[2]
Reclassification adjustment for settlement losses and other activity related to benefit plans, net of income taxes impact, respectively	(1)	[2]	(1)	[2]	(2)		(44)
Total other comprehensive (loss) income	(4,813)		(282)		(9,917)		276
Total comprehensive income	7,439		9,331		13,689		19,201
Reclassification adjustment for settlement losses and other activity related to benefit plans, net of income taxes impact, respectively	$ (1)	[2]	$ (1)	[2]	$ (2)		$ (44)

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

[2] 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.