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Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accumulated Other Comprehensive Loss
Balance	$ 8,801,134	$ 5,650,403	$ 5,890,415	$ 5,533,098
Net comprehensive income	56,097	140,571	290,909	102,896
Balance	9,011,126	5,904,580	9,011,126	5,904,580
Benefit Plans
Accumulated Other Comprehensive Loss
Balance	578	627	578	627
Balance	578	627	578	627
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Loss
Balance	(372,687)	(620,838)	(607,499)	(583,163)
Other comprehensive income before reclassifications	56,097	140,571	117,241	102,896
Amounts reclassified from accumulated other comprehensive loss			173,668
Net comprehensive income	56,097	140,571	290,909	102,896
Balance	(316,590)	(480,267)	(316,590)	(480,267)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Balance	(372,109)	(620,211)	(606,921)	(582,536)
Other comprehensive income before reclassifications	56,097	140,571	117,241	102,896
Amounts reclassified from accumulated other comprehensive loss			173,668
Net comprehensive income	56,097	140,571	290,909	102,896
Balance	$ (316,012)	$ (479,640)	$ (316,012)	$ (479,640)

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