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DEPOSITS - Summary of Deposit Balances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deposits, by Type [Abstract]    
Non-interest bearing checking accounts $ 2,395,481 $ 1,833,665
Savings accounts 2,334,949 2,401,385
Interest-bearing checking accounts 1,304,043 1,207,511
Certificates of deposit 2,404,644 2,429,585
Brokered certificates of deposit 555,597 1,150,485
Total deposits $ 8,994,714 $ 9,022,631