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Investment Securities: Narrative-Realized Gains (Losses) (Details)
 3 Months Ended 6 Months Ended
Mar. 31, 2017
USD ($)
security
Mar. 31, 2016
USD ($)
security
Mar. 31, 2017
USD ($)
security
Mar. 31, 2016
USD ($)
security
Sep. 30, 2016
USD ($)
Investments [Abstract]          
Loss on sale of securities $ 23,000 $ 35,000 $ 36,000 $ 62,000  
Held-to-maturity securities, realized loss, number of securities | security 12 12 15 15  
Marketable securities, realized loss, previously recognized as a credit loss   $ 32,000   $ 59,000  
Security owned and pledged as collateral $ 6,920,000   $ 6,920,000   $ 7,040,000