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DEPOSITS - Interest Expenses on deposits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest Expense, Deposits [Abstract]      
Interest-bearing checking accounts $ 4,566 $ 4,914 $ 5,440
Savings 12,520 12,392 13,660
Certificates of deposit 30,277 28,068 25,246
Brokered certificates of deposit 19,174 21,928 24,904
Interest expense on deposits $ 66,537 $ 67,302 $ 69,250