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DEPOSITS - Summary of Deposit Balances (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Deposits, by Type [Abstract]    
Non-interest-bearing deposit accounts $ 5,440,247 $ 6,112,884
Interest-bearing saving accounts 3,687,203 3,902,888
Interest-bearing checking accounts 4,242,672 3,770,993
Certificates of deposit ("CDs") 2,754,776 2,250,876
Brokered CDs 310,339 105,826
Total deposits $ 16,435,237 $ 16,143,467