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DEPOSITS - Summary of Deposit Balances (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Deposits [Abstract]    
Non-interest bearing checking accounts $ 2,375,517 $ 2,395,481
Savings accounts 2,408,745 2,334,949
Interest-bearing checking accounts 1,348,469 1,304,043
Certificates of deposit 2,533,759 2,404,644
Brokered certificates of deposit 515,691 555,597
Total deposits $ 9,182,181 $ 8,994,714