Derivative Financial Instruments (Summary Amounts Included In Consolidated Statement Of Income Related To Derivatives) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest rate swaps and caps | Trading gains, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ 12	$ 161	$ 812	$ 4,185
Mortgage banking derivatives | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	4,791	(7,550)	8,431	(14,919)
Commodity contracts | Trading gains, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	49	0	226	0
Foreign exchange contracts | Trading gains, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	0	0	0	0
Covered call options | Fees from covered call options
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	2,578	1,069	12,969	4,811
Derivative contract held as economic hedge on MSRs | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ (726)	$ 0	$ 220	$ 0