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Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss)
Balance	$ 9,059,108	$ 5,890,415
Accumulated Other Comprehensive Income (Loss)	(42,728)	230,254
Balance	9,030,916	8,624,361
Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Balance	565	578
Balance	565	578
Unrealized Losses on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss)
Balance	(283,946)	(607,499)
Other comprehensive income (loss) before reclassifications	(42,728)	56,586
Amounts reclassified from accumulated other comprehensive loss		173,668
Accumulated Other Comprehensive Income (Loss)	(42,728)	230,254
Balance	(326,674)	(377,245)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance	(283,381)	(606,921)
Other comprehensive income (loss) before reclassifications	(42,728)	56,586
Amounts reclassified from accumulated other comprehensive loss		173,668
Accumulated Other Comprehensive Income (Loss)	(42,728)	230,254
Balance	$ (326,109)	$ (376,667)

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