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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning balance of credit loss $ 1,071 $ 1,153
Additional increases to the amount related to credit loss for which OTTI was previously recognized 0 12
Realized losses previously recorded as credit losses (60) (13)
Recovery of prior credit loss (106) (32)
Ending balance of credit loss $ 905 $ 1,120