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Investment Securities: Narrative-Realized Gains (Losses) (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
USD ($)
security
Sep. 30, 2017
USD ($)
security
Sep. 30, 2016
USD ($)
security
Investments [Abstract]      
Loss on sale of securities $ 80 $ 171 $ 239
Held-to-maturity securities, realized loss, number of securities | security 16 22 20
Security owned and pledged as collateral $ 12,100 $ 6,824