Investment Securities: Narrative-Realized Gains (Losses) (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2016 USD ($) security	Mar. 31, 2015 USD ($) security	Mar. 31, 2016 USD ($) security	Mar. 31, 2015 USD ($) security	Sep. 30, 2015 USD ($)
Investments [Abstract]
Marketable securities gain	$ 0	$ 0	$ 0	$ 45,000
Loss on sale of securities	$ 35,000	$ 21,000	$ 63,000	$ 38,000
Held-to-maturity securities, realized loss, number of securities | security	12	12	15	14
Held-to-maturity securities, unrecognized loss	$ 32,000		$ 59,000
Security owned and pledged as collateral	$ 7,140,000		$ 7,140,000		$ 7,250,000