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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
Dec. 31, 2021
Dec. 31, 2020
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Net recoveries on investment securities $ (8) $ (5)
Held-to-maturity Securities    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Recoveries (other than temporary impairment OTTI) on investment securities 8 5
Net recoveries on investment securities $ 8 $ 5
Minimum    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
OTTI significant inputs - Constant prepayment rate 6.00% 6.00%
OTTI significant inputs - Collateral default rate 1.56% 1.50%
OTTI significant inputs - Loss severity rate 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%
OTTI significant inputs - Collateral default rate 22.67% 23.73%
OTTI significant inputs - Loss severity rate 13.95% 10.07%
Weighted Average    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
OTTI significant inputs - Constant prepayment rate 12.50% 9.23%
OTTI significant inputs - Collateral default rate 12.14% 13.58%
OTTI significant inputs - Loss severity rate 3.30% 3.44%