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Deposits - Additional Information About Corporation's Deposits (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Deposit Liability [Line Items]    
Deposits from foreign sources (primarily Mexico) $ 1,069,964 $ 993,479
Non-interest-bearing public funds deposits 18,565,820 18,423,018
Interest-bearing public funds deposits 27,994,366 24,272,678
Total deposits not covered by deposit insurance 26,614,691 24,125,359
Time deposits not covered by deposit insurance 407,758 238,608
Public Funds [Member]    
Deposit Liability [Line Items]    
Non-interest-bearing public funds deposits 688,227 1,235,026
Interest-bearing public funds deposits $ 746,671 $ 810,863