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SHAREHOLDERS EQUITY - Stock based compensation - Restricted Stock Awards (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 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		$ 0.1	$ 0.2	$ 0.3
Number of stock awards vested				10,526	10,527
Unrecognized compensation expense				$ 0.3
Unrecognized compensation expense recognition period (in years)				1 year
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					$ 0.1
Shares non-vested		14,114			14,114
Performance based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock awards vested					30,088
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense		$ 0.1			$ 0.2
Unrecognized compensation expense recognition period (in years)				1 year