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OREO and Other Repossessed Assets: Other Real Estate, Roll Forward (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
USD ($)
property
Sep. 30, 2017
USD ($)
property
Sep. 30, 2016
USD ($)
property
OREO and Other Repossessed Assets      
OREO and Other Repossessed Assets, Amount, Starting Balance $ 3,301 $ 4,117  
Additions to OREO and other repossessed assets, amount 324 751  
Writedowns, amount (248) (42)  
Sales of OREO and other repossessed assets, amount (1,464) (1,525)  
OREO and Other Repossessed Assets, Amount, Ending Balance $ 1,913 $ 3,301 $ 4,117
Other Real Estate, Number Of Contracts [Roll Forward]      
OREO and Other Repossessed Assets, Number, Starting Balance | property 16 23  
Additions to OREO and other repossessed assets, number 2 4 142
Writedowns, number | property 0 0  
Sales of OREO and other repossessed assets, number | property (6) (11)  
OREO and Other Repossessed Assets, Number, Ending Balance | property 12 16 23