Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		$ (74,416)			$ (74,416)
Debt Securities, Available-for-sale, Realized Loss	$ 0		$ 0		0	$ (197)
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	(2,059)		(2,122)		(3,986)	(4,182)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	1,264		(6,787)		8,532	(26,248)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	1,437		4,769		2,555	9,592
Labor and Related Expense	126,994		121,581		250,890	240,976
Other Comprehensive Income (Loss), Net of Tax	20,847	39,272	(9,333)	$ (38,785)	60,119	(48,117)
Ending Balance	(14,297)				(14,297)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(23,655)	(48,993)	(169,388)	(148,641)	(48,993)	(148,641)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	21,317		(11,126)		53,149	(41,014)
Debt Securities, Available-for-sale, Realized Loss						197
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	2,059		2,122		3,986	4,182
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	(5,830)		2,253		(14,251)	9,138
Other Comprehensive Income (Loss), Net of Tax	17,545		(6,751)		42,884	(27,498)
Ending Balance	(6,109)	(23,655)	(176,139)	(169,388)	(6,109)	(176,139)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	9,135	(1,268)	(13,246)	3,080	(1,268)	3,080
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	1,264		(6,787)		8,532	(26,248)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	1,437		4,769		2,555	9,592
Labor and Related Expense	0		0		0	0
Other Expenses	0		0		0	0
Other Comprehensive Income (Loss), Tax	650		(503)		2,668	(2,192)
Other Comprehensive Income (Loss), Net of Tax	3,352		(2,522)		13,755	(18,848)
Ending Balance	12,487	9,135	(15,768)	(13,246)	12,487	(15,768)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(20,624)	(24,154)	(27,247)	(25,535)	(24,154)	(25,535)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0		0		4,770	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	(63)		(73)		126	144
Other Expenses	(4)		(7)		(8)	(14)
Other Comprehensive Income (Loss), Tax	17		20		(1,157)	(1,614)
Other Comprehensive Income (Loss), Net of Tax	(50)		(60)		3,480	(1,772)
Ending Balance	(20,674)	(20,624)	(27,307)	(27,247)	(20,674)	(27,307)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(35,144)	(74,416)	(209,881)	(171,096)	(74,416)	(171,096)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	21,317		(11,126)		57,919	(41,014)
Debt Securities, Available-for-sale, Realized Loss						197
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	2,059		2,122		3,986	4,182
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	1,264		(6,787)		8,532	(26,248)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	1,437		4,769		2,555	9,592
Labor and Related Expense	(63)		(73)		126	144
Other Expenses	(4)		(7)		(8)	(14)
Other Comprehensive Income (Loss), Tax	(5,164)		1,769		(12,740)	5,333
Other Comprehensive Income (Loss), Net of Tax	20,847	39,272	(9,333)	(38,785)	60,119	(48,117)
Ending Balance	$ (14,297)	$ (35,144)	$ (219,214)	$ (209,881)	$ (14,297)	$ (219,214)