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SHAREHOLDERS EQUITY - Stock based compensation - Restricted Stock Awards (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2017
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued			105,264
Value of shares issued			$ 3.0
Weighted-average grant date fair value (in dollars per share)	$ 28.50
Recognized compensation expense	$ 0.1	$ 0.2
Unrecognized compensation expense	$ 0.4
Unrecognized compensation expense recognition period (in years)	1 year
Number of stock awards vested	0	0
Employee service period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued			52,632
Value of shares issued			$ 1.5
Vesting period (in years)			5 years
Performance of mortgage division
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued			52,632
Value of shares issued			$ 1.5
Recognized compensation expense		$ 0.2
Shares non-vested		14,114
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense		$ 0.1