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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning balance of credit loss $ 885 $ 1,071
Additional increases to the amount related to credit loss for which OTTI was previously recognized 0 2
Realized losses previously recorded as credit losses (5) (65)
Recovery of prior credit loss (14) (112)
Ending balance of credit loss $ 866 $ 896