Derivative Financial Instruments (Narrative) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) derivativeInstrument	Apr. 30, 2022 USD ($)	Dec. 31, 2021 derivativeInstrument	Mar. 31, 2021 derivativeInstrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest expense in the next twelve months	$ 16,400
Net derivative liability position, aggregate fair value	271
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	$ 19,000
Mortgage banking derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Number of derivative instruments held | derivativeInstrument	0		0	0
Not designated as hedging instrument | Interest rate contract
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 1,000,000
Not designated as hedging instrument | Interest rate contract, qualified borrowers
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	9,700,000
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	761,700
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	404,700
Not designated as hedging instrument | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 13,900
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 | Interest Rate Collar
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate derivatives held | derivativeInstrument	1
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
Derivative term	5 years
Fair value of derivative contracts	$ 66,500
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated | Subsequent Event
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		$ 500,000
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated, Original Swap Maturing March 2023 | Subsequent Event
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivative contracts		3,700
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated, Original Swap Maturing April 2024 | Subsequent Event
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivative contracts		$ 10,700
Interest rate derivatives designated as Fair Value Hedges | Designated as hedging instrument | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate derivatives held | derivativeInstrument	14
Notional amount	$ 211,300
Interest rate derivatives designated as Fair Value Hedges | Designated as hedging instrument | Interest Rate Swap, Term Beginning Subsequent To Period End
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate derivatives held | derivativeInstrument	1
Notional amount	$ 73,900