Derivatives - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2026	Dec. 31, 2025
Derivative [Line Items]
Gross amounts recognized	$ 387,420	$ 409,467
Derivative liabilities - fair value	407,529	385,973
Derivatives not Designated as Hedging Instruments
Derivative [Line Items]
Gross amounts recognized	379,019	369,470
Derivative liabilities - fair value	392,824	385,834
Notional amount	23,326,366	23,840,799
Interest rate contracts | Derivatives not Designated as Hedging Instruments
Derivative [Line Items]
Gross amounts recognized	253,126	258,561
Derivative liabilities - fair value	253,662	256,731
Notional amount	17,722,136	18,987,277
Interest rate contracts | Derivative Instruments Designated as Hedging Instruments | Cash Flow Hedging
Derivative [Line Items]
Gross amounts recognized	8,401	39,997
Derivative liabilities - fair value	14,705	139
Notional amount	4,000,000	4,250,000
Net unrealized losses, net of tax, recorded in AOCI expected to be reclassified into earnings during next 12 months	5,000
Interest rate contracts | Derivative Instruments Designated as Hedging Instruments | Commercial Banking | Cash Flow Hedging
Derivative [Line Items]
Notional amount	4,000,000
Foreign exchange contracts | Derivatives not Designated as Hedging Instruments
Derivative [Line Items]
Gross amounts recognized	60,269	44,340
Derivative liabilities - fair value	56,384	43,160
Notional amount	$ 5,232,565	$ 4,550,101
Foreign exchange contracts | Derivatives not Designated as Hedging Instruments | Maximum
Derivative [Line Items]
Original maturity (in years)	1 year	1 year
Credit contracts | Derivatives not Designated as Hedging Instruments
Derivative [Line Items]
Gross amounts recognized	$ 6	$ 25
Derivative liabilities - fair value	130	51
Notional amount	371,665	303,421
Credit contracts | Derivatives not Designated as Hedging Instruments | RPAs
Derivative [Line Items]
Gross amounts recognized	0	0
Derivative liabilities - fair value	130	51
Notional amount	203,784	133,756
Maximum exposure of RPAs with protection sold	921	590
Credit-risk-related contingent features
Derivative [Line Items]
Aggregate fair value of derivative instruments in net liability position	1,000	3,000
Collateral posted	1,000	3,000
LCH | Interest rate contracts | Derivatives not Designated as Hedging Instruments
Derivative [Line Items]
Gross amounts recognized	20,000	16,000
Derivative liabilities - fair value	$ 12,000	$ 3,000