Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 491,867	$ 442,453
Liability Derivatives, Fair Value	1,481,364	93,843
Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	473,275	438,151
Liability Derivatives, Fair Value	1,469,637	92,830
Fair Value Hedges [Member] | Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	18,592	4,302
Liability Derivatives, Fair Value	11,727	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	228	258
Liability Derivatives, Fair Value	11,723	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	56,167	8,137
Liability Derivatives, Fair Value		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	18,364	4,044
Liability Derivatives, Fair Value	4	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	843	11,728
Liability Derivatives, Fair Value	49,149	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	371,834	410,056
Liability Derivatives, Fair Value	1,378,145	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	44,431	8,230
Liability Derivatives, Fair Value	$ 42,343	$ 7,156