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Investment Securities: Narrative-Realized Gains (Losses) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
USD ($)
security
Mar. 31, 2017
USD ($)
security
Mar. 31, 2018
USD ($)
security
Mar. 31, 2017
USD ($)
security
Sep. 30, 2017
USD ($)
Investments [Abstract]          
Loss on sale of securities $ 19 $ 23 $ 41 $ 36  
Held-to-maturity securities, realized loss, number of securities | security 15 12 15 15  
Security owned and pledged as collateral $ 7,800   $ 7,800   $ 6,820