Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	$ (1,692)	$ 6,680	$ 5,792	$ 34,421
Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax	(67,883)	(95,714)	21,153	40,690
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	0	0	(206)	(698)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(66,191)	(102,394)	15,155	$ 5,571
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	(8,334)	876	(26,875)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax	21,610	(116,867)	(19,537)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	0	154	492
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	29,944	(117,589)	7,830
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	38	(12)	1,754
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(6,221)	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	0	52	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(6,259)	(40)	(1,754)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(8,372)	888	(28,629)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	27,831	(116,867)	(19,537)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	0	206	492
Other Comprehensive Income (Loss), Net of Tax	36,203	(117,549)	9,584
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	0	0	2,235
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	10	(3)	466
Gain (Loss) on Sale of Investments	(7,875)	0	0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	7,875	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	1,654	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	10,549	(1,109)	34,019
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	48	(15)	(15)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	48	(15)	2,220
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	$ 0	$ 14	$ 0
OCI, Cash Flow Hedge, Reclassification for Discontinuance, Statement of Income or Comprehensive Income [Extensible Enumeration]	Miscellaneous	Miscellaneous	Miscellaneous
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	$ 7,875	$ 0	$ 0
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 6,221	$ 0	$ 0