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OREO and Other Repossessed Assets: Other Real Estate, Roll Forward (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2019
USD ($)
property
Sep. 30, 2018
USD ($)
property
OREO and Other Repossessed Assets    
OREO and Other Repossessed Assets, Amount, Starting Balance | $ $ 1,913 $ 3,301
Additions to OREO and other repossessed assets, amount | $ 293 324
Writedowns, amount | $ (24) (248)
Sales of OREO and other repossessed assets, amount | $ (524) (1,464)
OREO and Other Repossessed Assets, Amount, Ending Balance | $ $ 1,683 $ 1,913
Other Real Estate, Number Of Contracts [Roll Forward]    
OREO and Other Repossessed Assets, Number, Starting Balance | property 12 16
Additions to OREO and other repossessed assets, number | property 2 2
Writedowns, number | property 0 0
Sales of OREO and other repossessed assets, number | property (3) (6)
OREO and Other Repossessed Assets, Number, Ending Balance | property 12 12
South Sound Bank    
OREO and Other Repossessed Assets    
Additions to OREO and other repossessed assets, amount | $ $ 25 $ 0
Other Real Estate, Number Of Contracts [Roll Forward]    
Additions to OREO and other repossessed assets, number | property 1 0