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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Balance, beginning of year $ 1,071 $ 1,153 $ 1,301
       Additional increases to the amount           related to credit loss for which OTTI           was previously recognized 3 13 14
       Realized losses previously recorded           as credit losses (66) (23) (80)
Recovery of prior credit loss (123) (72) (82)
Balance, end of year $ 885 $ 1,071 $ 1,153