DEPOSITS (Additional Information) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Banking and Thrift [Abstract]
Demand Deposit Overdrafts Reclassified As Loan	$ 2,700	$ 2,000
Percentage of time deposits of $100,000 or more, of total deposits	19.00%
Interest expense on time deposits of $100,000 or more	$ 12,500	4,500	$ 3,200
Time Deposits [Line Items]
Total deposits	5,914,880	3,963,662
Director and Executive Officer [Member]
Time Deposits [Line Items]
Total deposits	$ 51,200	$ 29,900