ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Receivables [Abstract]
Performing TDRs	$ 20,248	$ 17,300	$ 20,061
Nonperforming TDRs	9,907		9,627
Total TDRs	$ 30,155		$ 29,688