Comprehensive Income - Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			$ (1,066,177)	$ (172,054)
Unrealized holding losses, net, before tax			(2,366)	(576,266)
Foreign currency translation adjustment, before tax			71	(14,564)
Unrealized losses on cash flow hedges			(365,739)	(429,310)
Total other comprehensive income (loss) before reclassifications, before tax			(368,034)	(1,020,140)
Amortization of unrealized holding losses on held-to-maturity securities				1,766
Accretion of net gain on terminated cash flow hedges, before tax			(91)	(90)
Net yield adjustment from cash flow hedges currently in effect, before tax			173,051	(35,500)
Amortization of prior service credit, before tax			(1,390)	(1,692)
Amortization of actuarial gains (losses), before tax			(3,686)	13,810
Total other comprehensive income (loss), before tax			(200,150)	(1,041,846)
Ending balance, before tax	$ (1,266,327)	$ (1,213,900)	(1,266,327)	(1,213,900)
Beginning balance, tax			276,147	44,476
Unrealized holding losses, net, tax			(588)	149,186
Foreign currency translation adjustment, tax			(18)	3,293
Unrealized losses on cash flow hedges, tax			90,679	111,150
Total other comprehensive income (loss) before reclassifications, tax			91,249	263,629
Amortization of unrealized holding losses on held-to-maturity securities, tax				(456)
Accretion of net gain on terminated cash flow hedges, tax			23	24
Net yield adjustment from cash flow hedges currently in effect, tax			(43,535)	9,192
Amortization of prior service credit, tax			155	413
Amortization of actuarial gains (losses), tax			410	(3,371)
Total other comprehensive income (loss), tax			48,302	269,431
Ending balance, tax	324,449	313,907	324,449	313,907
Beginning balance, net of tax			(790,030)	(127,578)
Unrealized holding losses, net of tax			(1,778)	(427,080)
Foreign currency translation adjustments, net of tax	(2,457)	(5,359)	53	(11,271)
Unrealized losses on cash flow hedges, net of tax			(275,060)	(318,160)
Total other comprehensive income (loss) before reclassifications, net of tax			(276,785)	(756,511)
Amortization of unrealized holding losses on held-to-maturity securities				1,310
Accretion of net gain on terminated cash flow hedges, net of tax			(68)	(66)
Net yield adjustment from cash flow hedges currently in effect, net of tax			129,516	(26,308)
Amortization of prior service credit, net of tax			(1,235)	(1,279)
Amortization of actuarial gains (losses), net of tax			(3,276)	10,439
Total other comprehensive income (loss)	(77,078)	(393,503)	(151,848)	(772,415)
Ending balance, net of tax	(941,878)	(899,993)	(941,878)	(899,993)
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			(272,856)	(360,276)
Amortization of prior service credit, before tax			(1,390)	(1,692)
Amortization of actuarial gains (losses), before tax			(3,686)	13,810
Total other comprehensive income (loss), before tax			(5,076)	12,118
Ending balance, before tax	(277,932)	(348,158)	(277,932)	(348,158)
Total other comprehensive income (loss)			(4,511)
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			(349,129)	83,531
Foreign currency translation adjustment, before tax			71	(14,564)
Unrealized losses on cash flow hedges			(365,739)	(429,310)
Total other comprehensive income (loss) before reclassifications, before tax			(365,668)	(443,874)
Accretion of net gain on terminated cash flow hedges, before tax			(91)	(90)
Net yield adjustment from cash flow hedges currently in effect, before tax			173,051	(35,500)
Total other comprehensive income (loss), before tax			(192,708)	(479,464)
Ending balance, before tax	(541,837)	(395,933)	(541,837)	(395,933)
Investment Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			(444,192)	104,691
Unrealized holding losses, net, before tax			(2,366)	(576,266)
Total other comprehensive income (loss) before reclassifications, before tax			(2,366)	(576,266)
Amortization of unrealized holding losses on held-to-maturity securities				1,766
Total other comprehensive income (loss), before tax			(2,366)	(574,500)
Ending balance, before tax	$ (446,558)	$ (469,809)	(446,558)	$ (469,809)
Total other comprehensive income (loss)			$ (1,778)