Derivatives - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Gross amounts recognized	$ 468,056	$ 523,133
Derivative liabilities - Fair value	436,446	545,885
Derivative instruments designated as hedging instruments
Derivative [Line Items]
Gross amounts recognized	41,220	5,647
Derivative liabilities - Fair value	3,131	35,211
Notional amount	4,250,000	5,250,000
Derivatives not designated as hedging instruments
Derivative [Line Items]
Gross amounts recognized	426,836	517,486
Derivative liabilities - Fair value	433,315	510,674
Notional amount	23,091,729	22,375,840
Interest rate contracts | Derivatives not designated as hedging instruments
Derivative [Line Items]
Gross amounts recognized	291,498	379,664
Derivative liabilities - Fair value	291,011	378,961
Notional amount	18,059,774	17,005,381
Interest rate contracts | Derivatives not designated as hedging instruments | LCH
Derivative [Line Items]
Gross amounts recognized	26,000	17,000
Derivative liabilities - Fair value	23,000	15,000
Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments
Derivative [Line Items]
Gross amounts recognized	41,220	5,647
Derivative liabilities - Fair value	3,131	35,211
Notional amount	4,250,000	5,250,000
Net unrealized losses, net of tax, recorded in AOCI expected to be reclassified into earnings during next 12 months	3,000
Foreign exchange contracts | Derivatives not designated as hedging instruments
Derivative [Line Items]
Gross amounts recognized	68,807	89,083
Derivative liabilities - Fair value	63,162	71,254
Notional amount	$ 4,821,785	$ 5,201,460
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	$ 17	$ 1
Derivative liabilities - Fair value	31	12
Notional amount	210,170	168,999
Credit contracts | Derivatives not designated as hedging instruments | RPAs
Derivative [Line Items]
Gross amounts recognized	0	0
Derivative liabilities - Fair value	31	12
Notional amount	133,634	133,174
Maximum exposure of RPAs with protection sold	534	170
Credit-risk-related contingent features
Derivative [Line Items]
Aggregate fair value of derivative instruments in net liability position	9,000	1,000
Collateral posted	7,000	$ 1,000
Additional collateral	2,000
Commercial Banking | Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 4,300,000