DEPOSITS - Summary of Deposits Balance (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Minimum [Member]
Deposits [Line Items]
Interest-bearing savings accounts	0.05%	0.05%
Interest-bearing checking accounts	0.05%	0.05%
Certificates of deposit	0.10%	0.10%
Brokered certificates of deposit	1.10%	0.85%
Maximum [Member]
Deposits [Line Items]
Interest-bearing savings accounts	0.40%	0.40%
Interest-bearing checking accounts	1.00%	1.00%
Certificates of deposit	4.00%	4.00%
Brokered certificates of deposit	3.00%	2.80%