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Deposits - Additional Information About Corporation's Deposits (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Deposit Liability [Line Items]    
Deposits from foreign sources (primarily Mexico) $ 1,080,897 $ 1,048,943
Non-interest-bearing public funds deposits 15,995,499 17,598,234
Interest-bearing public funds deposits 26,188,656 26,355,962
Total deposits not covered by deposit insurance 22,014,668 23,839,797
Time deposits not covered by deposit insurance 727,128 430,128
Public Funds [Member]    
Deposit Liability [Line Items]    
Non-interest-bearing public funds deposits 482,264 788,040
Interest-bearing public funds deposits $ 764,400 $ 758,761