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Business Combinations - Narrative (Details) - South Sound Merger - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Oct. 01, 2018
Mar. 31, 2020
Mar. 31, 2019
Business Acquisition [Line Items]      
Business combination, number of shares transferred (shares) 904,826    
Issued, value assigned $ 28,270    
Business combination, share price (dollars per share) $ 31.24    
Cash paid $ 6,900    
Total acquisition consideration 35,170    
Goodwill acquired $ 9,480    
Acquisition related costs   $ 69 $ 119
Timberland Bank      
Business Acquisition [Line Items]      
Shares issued (in dollars per share) $ 0.746    
South Sound Bank      
Business Acquisition [Line Items]      
Shares issued (in dollars per share) $ 5.68825    
Data Processing, Hosting, and Related Services      
Business Acquisition [Line Items]      
Acquisition related costs   67  
Professional Fees      
Business Acquisition [Line Items]      
Acquisition related costs   $ 2