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DEPOSITS - Summary of Deposit Balances (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Deposits [Abstract]    
Non-interest bearing checking accounts $ 3,081,936 $ 2,367,856
Savings accounts 2,883,801 2,437,345
Interest-bearing checking accounts 1,711,833 1,412,390
Certificates of deposit 2,655,725 2,695,749
Brokered certificates of deposit 363,391 435,089
Total deposits $ 10,696,686 $ 9,348,429