Derivatives - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative assets - Fair value	$ 523,133,000	$ 610,920,000
Derivative liabilities - Fair value	545,885,000	613,314,000
Derivative instruments designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	5,647,000	53,815,000
Derivative liabilities - Fair value	35,211,000	13,124,000
Notional amount	5,250,000,000	5,331,480,000
Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	517,486,000	557,105,000
Derivative liabilities - Fair value	510,674,000	600,190,000
Notional amount	22,375,840,000	23,333,449,000
Interest rate contracts | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	379,664,000	423,486,000
Derivative liabilities - Fair value	378,961,000	420,812,000
Notional amount	17,005,381,000	17,387,909,000
Interest rate contracts | Derivatives not designated as hedging instruments | LCH
Derivative [Line Items]
Derivative assets - Fair value	17,000,000	43,000,000
Derivative liabilities - Fair value	15,000,000	43,000,000
Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	5,647,000	50,421,000
Derivative liabilities - Fair value	35,211,000	13,124,000
Notional amount	5,250,000,000	5,250,000,000
Net unrealized losses, net of tax, recorded in AOCI expected to be reclassified into earnings during the next 12 months	11,000,000
Foreign exchange contracts | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	89,083,000	53,678,000
Derivative liabilities - Fair value	71,254,000	42,564,000
Notional amount	$ 5,201,460,000	$ 5,827,149,000
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]
Derivative assets - Fair value	$ 1,000	$ 1,000
Derivative liabilities - Fair value	12,000	25,000
Notional amount	168,999,000	118,391,000
Credit contracts | Derivatives not designated as hedging instruments | RPAs
Derivative [Line Items]
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	12,000	25,000
Notional amount	133,174,000	93,393,000
Maximum exposure of RPAs with protection sold	170,000	177,000
Credit-Risk-Related Contingent Features
Derivative [Line Items]
Aggregate fair value of derivative instruments in net liability position	1,000,000	9,000
Associated posted collateral	1,000,000	$ 0
Commercial Banking | Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 5,300,000,000