Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 243,764	$ 442,453
Liability Derivatives, Fair Value	808,439	93,843
Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	188,455	438,151
Liability Derivatives, Fair Value	808,304	92,830
Fair Value Hedges [Member] | Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	55,309	4,302
Liability Derivatives, Fair Value	135	1,013
Interest Rate Swap Agreements [Member] | Fair Value Hedges [Member] | Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	41,417	258
Liability Derivatives, Fair Value		465
Commitments to Sell Real Estate Loans [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member] | Mortgage Banking [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	37,090	8,137
Liability Derivatives, Fair Value	3,376	4,108
Commitments to Sell Real Estate Loans [Member] | Fair Value Hedges [Member] | Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	13,892	4,044
Liability Derivatives, Fair Value	135	548
Mortgage-Related Commitments to Originate Real Estate Loans for Sale [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member] | Mortgage Banking [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	6,524	11,728
Liability Derivatives, Fair Value	30,705	5,288
Interest Rate Contracts [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member] | Other [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	121,112	410,056
Liability Derivatives, Fair Value	754,154	76,278
Foreign Exchange and Other Option and Futures Contracts [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member] | Other [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	23,729	8,230
Liability Derivatives, Fair Value	$ 20,069	$ 7,156