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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2019
Sep. 30, 2021
Oct. 01, 2019
Leases [Abstract]          
Operating lease right-of-use ("ROU") assets $ 2,206     $ 2,283 [1] $ 2,890
Operating lease cost 94 $ 93      
Short-term lease cost 0 0      
Total lease cost 94 $ 93      
Operating cash flows from operating leases $ 87   $ 327    
Weighted average remaining lease term-operating leases 8 years 2 months 12 days     8 years 4 months 24 days  
Weighted average discount rate-operating leases 2.24%     2.24%  
[1] Derived from audited consolidated financial statements.