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Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]      
Other comprehensive (income) loss, defined benefit plan, prior service cost (credit), tax $ 537 $ 561 $ 601
Net actuarial loss, tax 512 (2,459) (5,122)
Adjustment to other comprehensive income, tax 0 0 (6)
Other comprehensive income (loss), defined benefit plan, gain (loss) arising during period, tax (1,232) (30,516) (21,979)
OCI, debt securities, available-for-sale, gain (loss), after adjustment, tax 23 0 0
Interest rate hedge, tax $ 0 $ 116 $ 596