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Investment Securities: Narrative-Realized Gains (Losses) (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2016
USD ($)
security
Jun. 30, 2015
USD ($)
security
Jun. 30, 2016
USD ($)
security
Jun. 30, 2015
USD ($)
security
Sep. 30, 2015
USD ($)
Investments [Abstract]          
Marketable securities gain $ 0 $ 0 $ 0 $ 45,000  
Loss on sale of securities $ 17,000 $ 20,000 $ 81,000 $ 58,000  
Held-to-maturity securities, realized loss, number of securities | security 13 12 16 14  
Held-to-maturity securities, unrecognized loss $ 15,000   $ 74,000    
Security owned and pledged as collateral $ 7,100,000   $ 7,100,000   $ 7,250,000