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OPERATING LEASE RIGHT OF USE ASSETS AND LIABILITIES - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]        
Weighted-average discount rate 2.31%   2.31%  
Weighted-average remaining lease term (in years) 11 years 2 months 23 days   11 years 2 months 23 days  
Lease expense $ 991 $ 869 $ 1,945 $ 1,613
Short-term and variable lease cost 69 156 132 334
ROU asset impairment 0 0 224 0
Sublease income (177) (175) (285) (364)
Total lease cost for operating leases $ 883 $ 850 $ 2,016 $ 1,583