Derivatives - Narrative (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Gross amounts recognized	$ 765,161,000	$ 755,328,000
Derivative liabilities - Fair value	811,725,000	887,264,000
Derivative instruments designated as hedging instruments
Derivative [Line Items]
Notional amount	5,331,480,000	3,534,832,000
Gross amounts recognized	6,076,000	19,045,000
Derivative liabilities - Fair value	51,862,000	19,687,000
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	22,719,879,000	20,056,255,000
Gross amounts recognized	759,085,000	736,283,000
Derivative liabilities - Fair value	759,863,000	867,577,000
Interest rate contracts | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	17,885,894,000	16,932,414,000
Gross amounts recognized	527,805,000	426,828,000
Derivative liabilities - Fair value	539,585,000	564,829,000
Interest rate contracts | Derivatives not designated as hedging instruments | Overlay Swap
Derivative [Line Items]
Notional amount	161,900,000
Interest rate contracts | Derivatives not designated as hedging instruments | LCH
Derivative [Line Items]
Gross amounts recognized	24,600,000	167,200,000
Derivative liabilities - Fair value	63,500,000	81,300,000
Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments
Derivative [Line Items]
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 next 12 months	65,500,000
Gross amounts recognized	2,430,000	13,455,000
Derivative liabilities - Fair value	51,862,000	19,687,000
Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments | Overlay Swap
Derivative [Line Items]
Notional amount	1,000,000,000
Foreign exchange contracts | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	4,724,615,000	2,982,891,000
Gross amounts recognized	91,936,000	47,519,000
Derivative liabilities - Fair value	$ 72,342,000	$ 44,117,000
Foreign exchange contracts | Derivatives not designated as hedging instruments | Maximum
Derivative [Line Items]
Original maturity (in years)	1 year	1 year
Credit contracts (2) | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 109,370,000	$ 140,950,000
Gross amounts recognized	0	0
Derivative liabilities - Fair value	$ 16,000	$ 23,000
Credit contracts (2) | Derivatives not designated as hedging instruments | RPAs - protection sold
Derivative [Line Items]
Weighted average remaining maturity of outstanding RPAs	2 years 6 months	2 years 4 months 24 days
Credit-risk-related contingent features
Derivative [Line Items]
Aggregate fair value of derivative instruments in net liability position	$ 13,000	$ 2,600,000
Collateral posted	0	$ 1,100,000
Commercial Banking | Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 5,250,000,000