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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 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Net recoveries on investment securities $ (6) $ (6) $ (14) $ (113)
Held-to-maturity Securities        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Recoveries (other than temporary impairment OTTI) on investment securities 6 6 14 113
Net recoveries on investment securities $ 6 $ 6 $ 14 $ 113
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 1.83% 2.00% 1.83% 2.00%
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 21.58% 19.96% 21.58% 19.96%
OTTI significant inputs - Loss severity rate 14.53% 12.41% 14.53% 12.41%
Weighted Average        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
OTTI significant inputs - Constant prepayment rate 12.84% 9.21% 12.84% 9.21%
OTTI significant inputs - Collateral default rate 13.09% 10.21% 13.09% 10.21%
OTTI significant inputs - Loss severity rate 4.82% 2.48% 4.82% 2.48%