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DEPOSITS - Summary of Deposit Balances (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Deposits [Abstract]    
Non-interest bearing checking accounts $ 2,404,932 $ 2,367,856
Savings accounts 2,584,201 2,437,345
Interest-bearing checking accounts 1,424,261 1,412,390
Certificates of deposit 2,696,967 2,695,749
Brokered certificates of deposit 451,952 435,089
Total deposits $ 9,562,313 $ 9,348,429