Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Consolidated Statements of Comprehensive Income (Loss)
Net income	$ 25,958	$ 24,148	$ 26,618
Available-for-sale debt securities:
Unrealized holding gains (losses) on available-for-sale debt securities	1,670	11,512	(69,828)
Reclassification adjustment for losses (gains) realized in income	0	3,036	(20)
Other comprehensive income (loss) on available-for-sale debt securities	1,670	14,548	(69,848)
Unfunded pension and postretirement obligations:
Changes from plan amendments and actuarial gains and losses	405	(9)	389
Amortization of prior service cost and net actuarial loss and curtailment gain included in net periodic benefit cost	(552)	(56)	(42)
Other comprehensive (loss) income on pension and postretirement obligations	(147)	(65)	347
Other comprehensive income (loss) before income tax	1,523	14,483	(69,501)
Income tax related to other comprehensive (income) loss	153	(3,042)	14,597
Net other comprehensive income (loss)	1,676	11,441	(54,904)
Comprehensive income (loss)	$ 27,634	$ 35,589	$ (28,286)