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DEPOSITS - Summary of Deposit Balances (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Deposits, by Type [Abstract]    
Non-interest-bearing deposit accounts $ 6,235,782 $ 7,027,513
Interest-bearing saving accounts 4,089,664 4,729,387
Interest-bearing checking accounts 4,076,258 3,492,645
Certificates of deposit ("CDs") 2,122,713 2,434,932
Brokered CDs 45,164 100,417
Total $ 16,569,581 $ 17,784,894