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DEPOSITS - Summary of Deposit Balances (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Deposits [Abstract]    
Non-interest bearing checking accounts $ 2,321,050 $ 1,833,665
Savings accounts 2,371,390 2,401,385
Interest-bearing checking accounts 1,414,267 1,207,511
Certificates of deposit 2,367,795 2,429,585
Brokered certificates of deposit 673,741 1,150,485
Total deposits $ 9,148,243 $ 9,022,631