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Deposits - Components of Deposits (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Deposits, by Component, Alternative [Abstract]    
Demand, non-interest bearing $ 4,758,682 $ 1,885,045
Demand, interest bearing 5,824,410 8,476,027
Savings, including money market deposit accounts 3,617,946 3,546,015
Time 3,994,326 4,249,866
Total deposits $ 18,195,364 $ 18,156,953