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OREO and Other Repossessed Assets: Narrative (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2019
USD ($)
property
Sep. 30, 2018
USD ($)
property
Sep. 30, 2017
USD ($)
Real Estate Properties [Line Items]      
Other real estate owned (“OREO”) and other repossessed assets, net $ 1,683 $ 1,913 $ 3,301
(Gain) loss on sales of OREO and other repossessed assets, net 89 $ 229 $ 54
Recorded amount of foreclosed residential real estate properties held in OREO $ 150    
Washington      
Real Estate Properties [Line Items]      
OREO, number of repossessed assets | property 12    
Number of other repossessed assets | property 0 0  
Washington | Minimum      
Real Estate Properties [Line Items]      
Other real estate owned (“OREO”) and other repossessed assets, net $ 13    
Washington | Maximum      
Real Estate Properties [Line Items]      
Other real estate owned (“OREO”) and other repossessed assets, net $ 874