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Investment Securities: Narrative-Realized Gains (Losses) (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
USD ($)
security
Sep. 30, 2016
USD ($)
security
Sep. 30, 2015
USD ($)
security
Investments [Abstract]      
Loss on sale of securities $ 171 $ 239 $ 91
Held-to-maturity securities, realized loss, number of securities | security 22 20 15
Security owned and pledged as collateral $ 6,824 $ 7,039