Derivative Financial Instruments (Income Statement Effect) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ 2,545	$ (4,438)
Interest Rate Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	1,290	(3,687)
Mortgage Banking Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(22)	(16)
Other | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	1,277	(735)
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(10,798)	(812)
Cash Flow Hedging | Interest Rate Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	34	76
Cash Flow Hedging | Interest Rate Derivatives | Other Income | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(10,764)	(736)
Fair Value Hedging [Member] | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	1,320	(192)
Fair Value Hedging [Member] | Operating Expense | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	10,427
Fair Value Hedging [Member] | Operating Expense | Designated as Hedging Instrument | Long-term Debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ (1,320)	$ (10,235)