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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning balance of credit loss $ 1,301 $ 1,505
Additional increases to the amount related to credit loss for which OTTI was previously recognized 14 0
Realized losses previously recorded as credit losses (69) (48)
Recovery of prior credit loss (55) 0
Ending balance of credit loss $ 1,191 $ 1,457