Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (74,416)
Labor and Related Expense	(521,723)	$ (487,956)	$ (468,355)
Other Comprehensive Income (Loss), Net of Tax, Total	66,850	96,681	101,703
Ending Balance	(7,566)	(74,416)
Debt Securities, Available-for-sale, Realized Loss	0	(148,380)	(65,022)
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	(7,730)	(8,360)	(9,025)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	7,243	(21,537)	(13,254)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	4,172	16,478	13,930
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(48,993)	(148,641)	(233,192)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	54,271	(23,978)	41,145
Labor and Related Expense	0	0	0
Other Expenses	0	0	0
Other Comprehensive Income (Loss), Tax	(15,464)	(33,114)	(30,560)
Other Comprehensive Income (Loss), Net of Tax, Total	46,537	99,648	84,550
Ending Balance	(2,456)	(48,993)	(148,641)
Debt Securities, Available-for-sale, Realized Loss		148,380	64,940
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	7,730	8,360	9,025
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	0	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	0	0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,268)	3,080	3,360
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	0	0
Labor and Related Expense	0	0	0
Other Expenses	0	0	0
Other Comprehensive Income (Loss), Tax	2,747	710	(956)
Other Comprehensive Income (Loss), Net of Tax, Total	14,162	(4,348)	(280)
Ending Balance	12,894	(1,268)	3,080
Debt Securities, Available-for-sale, Realized Loss		0	0
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	0	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	7,243	(21,537)	(13,254)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	4,172	16,478	13,930
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(24,154)	(25,535)	(42,968)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	8,504	2,210	24,091
Labor and Related Expense	(252)	(290)	(326)
Other Expenses	16	(28)	(29)
Other Comprehensive Income (Loss), Tax	(2,117)	(511)	(6,304)
Other Comprehensive Income (Loss), Net of Tax, Total	6,151	1,381	17,432
Ending Balance	(18,003)	(24,154)	(25,535)
Debt Securities, Available-for-sale, Realized Loss		0	0
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	0	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	0	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	0	0
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(74,416)	(171,096)	(272,799)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	62,775	(21,768)	65,236
Labor and Related Expense	(252)	(290)	(326)
Other Expenses	16	(28)	(29)
Other Comprehensive Income (Loss), Tax	(14,834)	(32,915)	(37,820)
Other Comprehensive Income (Loss), Net of Tax, Total	66,850	96,681	101,703
Ending Balance	(7,566)	(74,416)	(171,096)
Debt Securities, Available-for-sale, Realized Loss		148,380	64,940
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	7,730	8,360	9,025
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	7,243	(21,537)	(13,254)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ 4,172	$ 16,478	$ 13,930