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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning balance of credit loss $ 1,153 $ 1,301
Additional increases to the amount related to credit loss for which OTTI was previously recognized 1 6
Realized losses previously recorded as credit losses (20) (22)
Recovery of prior credit loss (12) (26)
Ending balance of credit loss $ 1,122 $ 1,259