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Investment Securities: Narrative-Realized Gains (Losses) (Details)
3 Months Ended
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Sep. 30, 2016
USD ($)
Investments [Abstract]      
Marketable securities gain   $ 0  
Loss on sale of securities $ 13,000 $ 28,000  
Held-to-maturity securities, realized loss, number of securities | security 11 14  
Security owned and pledged as collateral $ 6,980,000   $ 7,040,000