Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total other comprehensive income (loss)	$ 65,464	$ (12,472)
Income tax benefit (expense)	(13,747)	2,619
Other comprehensive income (loss), net of tax	51,717	(9,853)
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]
Total reclassifications before tax	234,681	219,880
Income tax benefit (expense)	(49,221)	(45,783)
Total reclassifications, net of tax	185,460	174,097
Reclassification from Accumulated Other Comprehensive Income
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]
Total reclassifications before tax	(6,039)	(10,655)
Income tax benefit (expense)	1,268	2,237
Total reclassifications, net of tax	(4,771)	(8,418)
Accumulated other comprehensive income (loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss), net of tax	51,717	(9,853)
Net unrealized gains and (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total other comprehensive income (loss)	65,406	(13,154)
Income tax benefit (expense)	(13,735)	2,762
Other comprehensive income (loss), net of tax	51,671	(10,392)
Net unrealized gains and (losses) on available-for-sale securities | Reclassification from Accumulated Other Comprehensive Income
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]
Total reclassifications before tax	(5,981)	(9,973)
Income tax benefit (expense)	1,256	2,094
Total reclassifications, net of tax	(4,725)	(7,879)
Net benefit plan assets and (obligations) recognized in shareholders' equity
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total other comprehensive income (loss)	58	682
Income tax benefit (expense)	(12)	(143)
Other comprehensive income (loss), net of tax	46	539
Net benefit plan assets and (obligations) recognized in shareholders' equity | Reclassification from Accumulated Other Comprehensive Income
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]
Total reclassifications before tax	(58)	(682)
Income tax benefit (expense)	12	143
Total reclassifications, net of tax	$ (46)	$ (539)