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Business Combinations - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Oct. 01, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Goodwill acquired     $ 9,481  
South Sound Merger        
Business Acquisition [Line Items]        
Shares issued (shares) 904,826      
Issued, value assigned $ 28,267      
Business combination, share price (dollars per share) $ 31.24      
Cash paid $ 6,903      
Total merger consideration 35,170      
Goodwill acquired $ 9,481      
Acquisition related costs   $ 2 462  
Timberland Bank | South Sound Merger        
Business Acquisition [Line Items]        
Shares issued (in dollars per share) $ 0.746      
South Sound Bank        
Business Acquisition [Line Items]        
Acquisition related costs       $ 1,598
South Sound Bank | South Sound Merger        
Business Acquisition [Line Items]        
Shares issued (in dollars per share) $ 5.68825      
Data processing and telecommunications | South Sound Merger        
Business Acquisition [Line Items]        
Acquisition related costs     317  
Professional fees | South Sound Merger        
Business Acquisition [Line Items]        
Acquisition related costs     $ 145 $ 616