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Derivative Financial Instruments - Customer-Related Derivative Positions (Detail) - Not Designated as Hedging Instrument
$ in Thousands
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Interest rate swaps    
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]    
Number of Positions 494 576
Total Notional $ 3,009,150 $ 3,652,385
Risk participation agreements    
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]    
Number of Positions 64 70
Total Notional $ 238,772 $ 287,732
Matched commercial customer book    
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]    
Number of Positions 72 40
Total Notional $ 7,922 $ 4,242
Foreign currency loan    
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]    
Number of Positions 6 3
Total Notional $ 10,830 $ 10,798