Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 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 Gain on Available-for-Sale Securities Transfered to Held-to-maturity Securities	(2,122)		(2,289)		(4,182)	(4,556)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	(6,787)		(34,147)		(26,248)	(20,384)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	4,769		3,319		9,592	4,581
Labor and Related Expense	(121,581)		(114,089)		(240,976)	(230,510)
Other Comprehensive Income (Loss), Net of Tax	(9,333)	(38,785)	(58,054)	$ 39,211	(48,117)	(18,843)
Ending Balance	(219,214)				(219,214)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(169,388)	(148,641)	(204,339)	(233,192)	(148,641)	(233,192)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(11,126)		(49,066)		(41,014)	(12,588)
Debt Securities, Available-for-Sale, Realized Loss					197
Amortization of Net Unrealized Gain on Available-for-Sale Securities Transfered to Held-to-maturity Securities	2,122		2,289		4,182	4,556
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	2,253		11,843		9,138	1,951
Other Comprehensive Income (Loss), Net of Tax	(6,751)		(34,934)		(27,498)	(6,081)
Ending Balance	(176,139)	(169,388)	(239,273)	(204,339)	(176,139)	(239,273)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(13,246)	3,080	13,691	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 Gain on Available-for-Sale Securities Transfered to Held-to-maturity Securities	0		0		0	0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	(6,787)		(34,147)		(26,248)	(20,384)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	4,769		3,319		9,592	4,581
Labor and Related Expense	0		0		0	0
Other Expenses	0		0		0	0
Other Comprehensive Income (Loss), Tax	(503)		7,867		(2,192)	3,173
Other Comprehensive Income (Loss), Net of Tax	(2,522)		(22,961)		(18,848)	(12,630)
Ending Balance	(15,768)	(13,246)	(9,270)	13,691	(15,768)	(9,270)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(27,247)	(25,535)	(42,940)	(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 Gain 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)		(144)	(163)
Other Expenses	(7)		(7)		(14)	22
Other Comprehensive Income (Loss), Tax	20		(71)		(1,614)	8
Other Comprehensive Income (Loss), Net of Tax	(60)		(159)		(1,772)	(132)
Ending Balance	(27,307)	(27,247)	(43,099)	(42,940)	(27,307)	(43,099)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(209,881)	(171,096)	(233,588)	(272,799)	(171,096)	(272,799)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(11,126)		(49,066)		(41,014)	(12,588)
Debt Securities, Available-for-Sale, Realized Loss					197
Amortization of Net Unrealized Gain on Available-for-Sale Securities Transfered to Held-to-maturity Securities	2,122		2,289		4,182	4,556
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	(6,787)		(34,147)		(26,248)	(20,384)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	4,769		3,319		9,592	4,581
Labor and Related Expense	(73)		(81)		(144)	(163)
Other Expenses	(7)		(7)		(14)	22
Other Comprehensive Income (Loss), Tax	1,769		19,639		5,333	5,132
Other Comprehensive Income (Loss), Net of Tax	(9,333)	(38,785)	(58,054)	39,211	(48,117)	(18,843)
Ending Balance	$ (219,214)	$ (209,881)	$ (291,642)	$ (233,588)	$ (219,214)	$ (291,642)