DEPOSITS (Additional Information) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
Demand Deposit Overdrafts Reclassified As Loan	$ 1,400	$ 2,700
Percentage of time deposits of $100,000 or more, of total deposits	16.80%
Interest expense on time deposits of $100,000 or more	$ 23,900	12,500	$ 4,500
Time Deposits [Line Items]
Total deposits	6,440,319	5,914,880
Director and Executive Officer [Member]
Time Deposits [Line Items]
Total deposits	$ 29,900	$ 31,600