MBS And Other Investments: Narrative-Realized Gains (Losses) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2014 USD ($) security	Sep. 30, 2015 USD ($) security	Sep. 30, 2014 USD ($) security	Sep. 30, 2013 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Loss on sale of securities	$ 91	$ 465	$ 671
Held-to-maturity securities, realized loss, number of securities | security		15	15	18
Available-for-sale securities, realized loss, number of securities | security	6	16	5
Available-for-sale Securities, Gross Realized Gains			$ 32	$ 0
Available-for-sale Securities, Gross Realized Losses		$ 45
Security owned and pledged as collateral	$ 6,221	$ 7,249	$ 6,221