Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			$ (171,096)				$ (171,096)
Debt Securities, Available-for-Sale, Realized Loss	$ 0			$ 0			(197)	$ 0
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	(2,147)			(2,327)			(6,329)	(6,883)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	25,609			(13,592)			(639)	(33,976)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	4,705			4,516			14,297	9,097
Labor and Related Expense	(121,036)			(117,159)			(362,012)	(347,669)
Other Comprehensive Income (Loss), Net of Tax	107,466	$ (9,333)	(38,785)	(47,497)	$ (58,054)	$ 39,211	59,348	(66,340)
Ending Balance	(111,748)						(111,748)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(176,139)		(148,641)	(239,273)		(233,192)	(148,641)	(233,192)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	90,858			(56,924)			49,844	(69,512)
Debt Securities, Available-for-Sale, Realized Loss							197
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	2,147			2,327			6,329	6,883
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	0			0			0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0			0			0	0
Labor and Related Expense	0			0			0	0
Other Expenses	0			0			0	0
Other Comprehensive Income (Loss), Tax	(23,198)			13,928			(14,060)	15,879
Other Comprehensive Income (Loss), Net of Tax	69,807			(40,669)			42,309	(46,751)
Ending Balance	(106,332)	(176,139)		(279,943)	(239,273)		(106,332)	(279,943)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(15,768)		3,080	(9,270)		3,360	3,080	3,360
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0			0			0	0
Debt Securities, Available-for-Sale, Realized Loss							0
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	0			0			0	0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	25,609			(13,592)			(639)	(33,976)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	4,705			4,516			14,297	9,097
Labor and Related Expense	0			0			0	0
Other Expenses	0			0			0	0
Other Comprehensive Income (Loss), Tax	7,405			2,315			5,213	5,488
Other Comprehensive Income (Loss), Net of Tax	37,718			(6,762)			18,871	(19,391)
Ending Balance	21,951	(15,768)		(16,032)	(9,270)		21,951	(16,032)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(27,307)		(25,535)	(43,099)		(42,968)	(25,535)	(42,968)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0			0			0	0
Debt Securities, Available-for-Sale, Realized Loss							0
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	0			0			0	0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	0			0			0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0			0			0	0
Labor and Related Expense	(73)			(81)			(217)	(244)
Other Expenses	(7)			(7)			(21)	15
Other Comprehensive Income (Loss), Tax	20			23			(1,594)	31
Other Comprehensive Income (Loss), Net of Tax	(60)			(66)			(1,832)	(198)
Ending Balance	(27,367)	(27,307)		(43,166)	(43,099)		(27,367)	(43,166)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(219,214)		(171,096)	(291,642)		(272,799)	(171,096)	(272,799)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	90,858			(56,924)			49,844	(69,512)
Debt Securities, Available-for-Sale, Realized Loss							197
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	2,147			2,327			6,329	6,883
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	25,609			(13,592)			(639)	(33,976)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	4,705			4,516			14,297	9,097
Labor and Related Expense	(73)			(81)			(217)	(244)
Other Expenses	(7)			(7)			(21)	15
Other Comprehensive Income (Loss), Tax	(15,773)			16,266			(10,440)	21,398
Other Comprehensive Income (Loss), Net of Tax	107,466	(9,333)	$ (38,785)	(47,497)	(58,054)	$ 39,211	59,348	(66,340)
Ending Balance	$ (111,748)	$ (219,214)		$ (339,140)	$ (291,642)		$ (111,748)	$ (339,140)