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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning balance of credit loss $ 853 $ 885
Net realized gain (losses) previously recorded as credit losses 1 (3)
Recovery of prior credit loss (4) (5)
Ending balance of credit loss $ 850 $ 877