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Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value $ 374,790 $ 435,969
Liability Derivatives, Fair Value 1,295,532 1,355,326
Derivatives Not Designated and Qualifying as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 13,176 4,239
Liability Derivatives, Fair Value 1,543 9,103
Fair Value Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 313,397 379,868
Liability Derivatives, Fair Value 1,253,627 1,300,184
Fair Value Hedges [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 48,217 51,862
Liability Derivatives, Fair Value 40,362 46,039
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 3,631 1,202
Liability Derivatives, Fair Value 1,498 9,094
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 45,080 51,410
Liability Derivatives, Fair Value 47 14
Commitments to Sell Real Estate Loans [Member] | Fair Value Hedges [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 9,545 3,037
Liability Derivatives, Fair Value 45 9
Mortgage-Related Commitments to Originate Real Estate Loans for Sale [Member] | Fair Value Hedges [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 3,137 452
Liability Derivatives, Fair Value 40,315 46,025
Interest Rate Contracts [Member] | Fair Value Hedges [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 293,761 355,806
Liability Derivatives, Fair Value 1,234,889 1,278,180
Foreign Exchange and Other Option and Futures Contracts [Member] | Fair Value Hedges [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 19,636 24,062
Liability Derivatives, Fair Value $ 18,738 $ 22,004