OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Weighted-average discount rate	2.34%		2.34%
Weighted-average remaining lease term (years)	10 years 9 months		10 years 9 months
Lease expense	$ 1,119	$ 991	$ 2,256	$ 1,945
Short-term and variable lease cost	40	69	75	132
ROU asset impairment	0	0	0	224
Sublease income	(355)	(177)	(531)	(285)
Total lease cost for operating leases	$ 804	$ 883	$ 1,800	$ 2,016