Derivatives - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) Contract	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Derivative assets - Fair value	$ 610,920,000	$ 755,328,000
Derivative liabilities - Fair Value	613,314,000	887,264,000
Derivatives not designated as hedging instruments:
Derivative [Line Items]
Derivative assets - Fair value	557,105,000	736,283,000
Derivative liabilities - Fair Value	600,190,000	867,577,000
Notional amount	23,333,449,000	20,056,255,000
Derivative instruments designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	53,815,000	19,045,000
Derivative liabilities - Fair Value	13,124,000	19,687,000
Notional amount	5,331,480,000	3,534,832,000
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Derivative assets - Fair value	423,486,000	426,828,000
Derivative liabilities - Fair Value	420,812,000	564,829,000
Notional amount	17,387,909,000	16,932,414,000
Interest rate contracts | Derivatives not designated as hedging instruments: | London Clearing House
Derivative [Line Items]
Derivative assets - Fair value	43,000,000	167,000,000
Derivative liabilities - Fair Value	43,000,000	81,000,000
Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	50,421,000	13,455,000
Derivative liabilities - Fair Value	13,124,000	19,687,000
Notional amount	5,250,000,000	3,450,000,000
Net unrealized losses, net of tax, recorded in AOCI expected to be reclassified into earnings during the next 12 months	47,000,000
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Derivative assets - Fair value	53,678,000	47,519,000
Derivative liabilities - Fair Value	42,564,000	44,117,000
Notional amount	$ 5,827,149,000	$ 2,982,891,000
Foreign exchange contracts | Derivatives not designated as hedging instruments: | Maximum
Derivative [Line Items]
Original maturity (in years)	1 year	1 year
Credit Risk Contract | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Derivative assets - Fair value	$ 1,000	$ 0
Derivative liabilities - Fair Value	25,000	23,000
Notional amount	118,391,000	140,950,000
Credit Risk Contract | Derivatives not designated as hedging instruments: | RPAs - protection sold
Derivative [Line Items]
Notional amount	$ 25,000,000	$ 0
Number of instruments held | Contract	1
Credit Risk Contract | Derivatives not designated as hedging instruments: | RPAs - protection purchased
Derivative [Line Items]
Weighted average remaining maturity of outstanding RPAs	2 years 9 months 18 days	2 years 4 months 24 days
Maximum exposure of RPAs with protection sold	$ 177,000	$ 0
Credit-Risk-Related Contingent Features
Derivative [Line Items]
Aggregate fair value of derivative instruments in net liability position	9,000	3,000,000
Associated posted collateral	0	$ 1,000,000
Commercial Banking | Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 5,300,000,000