Derivative Financial Instruments (Income Statement Effect) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)		$ 4,734
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ 6,793
Interest Rate Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	6,445	4,644
Mortgage Banking Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(49)	(382)
Other | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	397	472
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(2,483)	(2,461)
Cash Flow Hedging | Interest Rate Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	76	121
Cash Flow Hedging | Interest Rate Derivatives | Other Income | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ (2,559)	$ (2,582)