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OREO and Other Repossessed Assets: Other Real Estate, Roll Forward (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
USD ($)
property
Sep. 30, 2016
USD ($)
property
Sep. 30, 2015
USD ($)
property
OREO and Other Repossessed Assets      
OREO and Other Repossessed Assets, Amount, Starting Balance $ 4,117 $ 7,854  
Additions to OREO and other repossessed assets, amount 751 307  
Capitalized improvements, amount 0 142  
Writedowns, amount (42) (435)  
Sales of OREO and other repossessed assets, amount (1,525) (3,751)  
OREO and Other Repossessed Assets, Amount, Ending Balance $ 3,301 $ 4,117 $ 7,854
Other Real Estate, Number Of Contracts [Roll Forward]      
OREO and Other Repossessed Assets, Number, Starting Balance | property 23 35  
Additions to OREO and other repossessed assets, number 4 4 3
Capitalized improvements, number | property 0 0  
Writedowns, number | property 0 0  
Sales of OREO and other repossessed assets, number | property (11) (16)  
OREO and Other Repossessed Assets, Number, Ending Balance | property 16 23 35