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Deposits - Additional Information About Corporation's Deposits (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Deposit Liability [Line Items]    
Deposits from foreign sources (primarily Mexico) $ 1,092,302 $ 993,479
Non-interest-bearing demand deposits 18,114,430 18,423,018
Interest-bearing deposits 26,316,499 24,272,678
Total deposits not covered by deposit insurance 25,213,248 24,125,359
Time deposits not covered by deposit insurance 357,529 238,608
Public Funds [Member]    
Deposit Liability [Line Items]    
Non-interest-bearing demand deposits 746,097 1,235,026
Interest-bearing deposits $ 975,511 $ 810,863