Derivative Financial Instruments - Narrative (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2022 USD ($) derivativeInstrument	Mar. 31, 2022 USD ($)	Sep. 30, 2024 USD ($) derivativeInstrument	Dec. 31, 2023 USD ($) derivativeInstrument	Sep. 30, 2023 derivativeInstrument	Jun. 30, 2022 USD ($) derivativeInstrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) to be reclassified from accumulated other comprehensive income during the next 12 months			$ (13,900,000)
Credit risk derivative, net asset value			97,500,000
Interest Rate Swap Terminated
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) to be reclassified from accumulated other comprehensive income during the next 12 months			13,300,000
Interest Rate Swap And Collar
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) to be reclassified from accumulated other comprehensive income during the next 12 months			(27,200,000)
Mortgage banking derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			$ 220,000,000.0	$ 195,000,000.0
Number of derivative instruments held | derivativeInstrument			8	4
Not designated as hedging instrument | Interest rate contract
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			$ 0
Not designated as hedging instrument | Interest rate contract, qualified borrowers
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			12,800,000,000	$ 11,400,000,000
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			288,900,000	129,900,000
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			667,600,000	626,900,000
Not designated as hedging instrument | Commodity forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			7,600,000	8,400,000
Not designated as hedging instrument | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			$ 108,900,000	$ 144,300,000
Not designated as hedging instrument | Covered call options
Derivative Instruments, Gain (Loss) [Line Items]
Number of derivative instruments held | derivativeInstrument			0	0	0
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			$ 6,700,000,000
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		$ 1,000,000,000				$ 500,000,000
Derivative term		5 years
Fair value of derivative contracts		$ 66,500,000
Number of derivative instruments held | derivativeInstrument						2
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated, Original Swap Maturing March 2023
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivative contracts						$ 3,700,000
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated, Original Swap Maturing April 2024
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivative contracts						$ 10,700,000
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Collar Terminated
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 64,300,000
Fair value of derivative contracts	$ 875,000
Number of derivative instruments terminated | derivativeInstrument	1
Interest rate derivatives designated as Fair Value Hedges | Designated as hedging instrument | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			$ 204,300,000
Number of interest rate derivatives | derivativeInstrument			13