Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss)
Balance	$ 9,030,916	$ 8,624,361	$ 9,059,108	$ 5,890,415
Net comprehensive income (loss)	15,974	4,558	(26,754)	234,812
Balance	9,131,468	8,801,134	9,131,468	8,801,134
Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Balance	565	578	565	578
Balance	565	578	565	578
Unrealized Losses on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss)
Balance	(326,674)	(377,245)	(283,946)	(607,499)
Other comprehensive income (loss) before reclassifications	15,974	4,558	(26,754)	61,144
Amounts reclassified from accumulated other comprehensive loss				173,668
Net comprehensive income (loss)	15,974	4,558	(26,754)	234,812
Balance	(310,700)	(372,687)	(310,700)	(372,687)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance	(326,109)	(376,667)	(283,381)	(606,921)
Other comprehensive income (loss) before reclassifications	15,974	4,558	(26,754)	61,144
Amounts reclassified from accumulated other comprehensive loss				173,668
Net comprehensive income (loss)	15,974	4,558	(26,754)	234,812
Balance	$ (310,135)	$ (372,109)	$ (310,135)	$ (372,109)

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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