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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
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 1
Realized losses previously recorded as credit losses (53) (20)
Recovery of prior credit loss (103) (12)
Ending balance of credit loss $ 915 $ 1,122