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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning balance of credit loss $ 885 $ 1,071
Realized losses previously recorded as credit losses (5) (60)
Recovery of prior credit loss (8) (106)
Ending balance of credit loss $ 872 $ 905