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Investment Securities: Schedule of significant inputs utilized to measure management's estimate of the credit loss component on OTTI securities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Net recoveries on investment securities $ (3) $ (3) $ (11) $ (8)
Held-to-maturity Securities        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Recoveries (other than temporary impairment OTTI) on investment securities 3 3 11 8
Net recoveries on investment securities $ 3 $ 3 $ 11 $ 8
Minimum        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
OTTI significant inputs - Constant prepayment rate 6.00% 6.00% 6.00% 6.00%
OTTI significant inputs - Collateral default rate 0.53% 1.73% 0.53% 1.73%
OTTI significant inputs - Loss severity rate 0.00% 0.00% 0.00% 0.00%
Maximum        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
OTTI significant inputs - Constant prepayment rate 15.00% 15.00% 15.00% 15.00%
OTTI significant inputs - Collateral default rate 21.55% 28.92% 21.55% 28.92%
OTTI significant inputs - Loss severity rate 8.53% 18.93% 8.53% 18.93%
Weighted Average        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
OTTI significant inputs - Constant prepayment rate 8.37% 13.18% 8.37% 13.18%
OTTI significant inputs - Collateral default rate 10.53% 13.94% 10.53% 13.94%
OTTI significant inputs - Loss severity rate 3.72% 5.79% 3.72% 5.79%