Derivative Financial Instruments (Narrative) (Detail)	3 Months Ended
	Mar. 31, 2023 USD ($) derivativeInstrument	Dec. 31, 2022 USD ($) derivativeInstrument	Sep. 30, 2022	Jun. 30, 2022 USD ($) derivativeInstrument	Mar. 31, 2022 USD ($) derivativeInstrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest expense in the next twelve months	$ 85,800,000
Net derivative liability position, aggregate fair value	0
Interest Rate Swap Terminated
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest expense in the next twelve months	19,200,000
Interest Rate Swap And Collar
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest expense in the next twelve months	66,600,000
Mortgage banking derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 245,000,000	$ 190,000,000
Number of derivative instruments held | derivativeInstrument	3	3
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 terminated
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		$ 1,000,000,000
Not designated as hedging instrument | Interest rate contract, qualified borrowers
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	9,900,000,000	9,600,000,000
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	208,200,000	121,600,000
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	498,000,000	321,000,000
Not designated as hedging instrument | Commodity forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	5,600,000	3,600,000
Not designated as hedging instrument | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 225,200,000	$ 226,200,000
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	$ 6,000,000,000
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount				$ 500,000,000	$ 1,000,000,000
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	$ 206,000,000
Number of interest rate derivatives | derivativeInstrument	14