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SECURITIES - Securities Portfolio Presented by Contractual Maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Securities Available for Sale, Amortized Cost [Abstract]          
Five to ten years $ 4,700   $ 4,700    
Amortized cost 5,114   5,114   $ 7,422
Securities Available for Sale, Fair Value [Abstract]          
Five to ten years 4,660   4,660    
Fair value 5,070   5,070   7,747
Securities Held to Maturity, Amortized Cost [Abstract]          
One to five years 0   0    
Five to ten years 0   0    
Amortized cost 4,629   4,629   8,611
Securities Held to Maturity, Fair Value [Abstract]          
One to five years 0   0    
Five to ten years 0   0    
Fair value 4,581   4,581   8,865
Debt Securities, Available-for-Sale and Held-to-Maturity, after Allowance for Credit Loss [Abstract]          
Amortized cost 9,743   9,743   16,033
Fair value 9,651   9,651   16,612
Proceeds from sales 2,100 $ 3,200 2,105 $ 3,240  
Gain on sale of securities available for sale 105 $ 240 105 $ 240  
U.S. GSE Securities | Residential Mortgage Backed Securities          
Securities Available for Sale, Amortized Cost [Abstract]          
Without single maturity date 414   414    
Amortized cost 414   414   722
Securities Available for Sale, Fair Value [Abstract]          
Without single maturity date 410   410    
Fair value 410   410   833
Securities Held to Maturity, Amortized Cost [Abstract]          
Without single maturity date 1,964   1,964    
Amortized cost 1,964   1,964   2,417
Securities Held to Maturity, Fair Value [Abstract]          
Without single maturity date 1,915   1,915    
Fair value 1,915   1,915   2,491
U.S. GSE Securities | Commercial Mortgage Backed Securities          
Securities Held to Maturity, Amortized Cost [Abstract]          
Without single maturity date 2,665   2,665    
Amortized cost 2,665   2,665   2,694
Securities Held to Maturity, Fair Value [Abstract]          
Without single maturity date 2,666   2,666    
Fair value $ 2,666   $ 2,666   $ 2,869