STOCK-BASED COMPENSATION - Performance Units - Additional Information (Detail) - Omnibus Plan [Member] - Performance Shares [member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted performance units	502,307
Stock-based compensation expense	$ 1.8	$ 1.1	$ 0.6
Unrecognized compensation cost related to unvested performance units	$ 2.6
Executives [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted performance units	502,307	200,053	304,408
Requisite service period	3 years
Performance units program description	The performance units will vest based on the achievement of a pre-established tangible book value per share target as of December 31, 2022. All of the performance units will vest if performance is at the pre-established performance target level or above. However, the participants may vest with respect to 50% of the awards to the extent that performance is below the target but at 80% of the pre-established performance target level (the “80% minimum threshold”), which is measured based upon the growth in the tangible book value during the performance cycle. If performance is between the 80% minimum threshold and the pre-established performance target level, the participants will vest on a proportional amount. No performance units will vest if performance is below the 80% minimum threshold.