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Investment Securities: Narrative-Realized Gains (Losses) (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2017
USD ($)
security
Jun. 30, 2016
USD ($)
security
Jun. 30, 2017
USD ($)
security
Jun. 30, 2016
USD ($)
security
Sep. 30, 2016
USD ($)
Investments [Abstract]          
Loss on sale of securities $ 12,000 $ 17,000 $ 48,000 $ 81,000  
Held-to-maturity securities, realized loss, number of securities | security 15 13 18 16  
Marketable securities, realized loss, previously recognized as a credit loss   $ 15,000   $ 74,000  
Security owned and pledged as collateral $ 6,880,000   $ 6,880,000   $ 7,040,000