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Investment Securities: Narrative-Realized Gains (Losses) (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Sep. 30, 2017
USD ($)
Investments [Abstract]      
Loss on sale of securities $ 22 $ 13  
Held-to-maturity securities, realized loss, number of securities | security 12 11  
Security owned and pledged as collateral $ 6,770   $ 6,820