Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	$ 123,564	$ 111,230	$ 243,200	$ 212,916
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract]
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax	(36,846)	21,317	(73,377)	53,149
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities	1,901	2,059	3,590	3,986
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax	8,717	(5,830)	17,407	(14,251)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax, Total	(26,228)	17,545	(52,380)	42,884
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(6,506)	1,264	(14,418)	8,532
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(597)	1,437	(1,343)	2,555
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(1,709)	650	(3,792)	2,668
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(8,812)	3,352	(19,553)	13,755
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(63)	(63)	(126)	(126)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	0	0	0	4,770
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	0	(4)	0	(8)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	15	17	31	(1,157)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax, Total	(48)	(50)	(95)	3,480
Other Comprehensive Income (Loss), Net of Tax, Total	(35,088)	20,847	(72,027)	60,119
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 88,476	$ 132,076	$ 171,173	$ 273,035