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Definitive Agreement (Details) - USD ($)
$ / shares in Units, $ in Millions
May 23, 2018
Jun. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]      
Shares outstanding (shares)   7,395,927 7,361,077
Common stock value (in dollars per share)   $ 0.01 $ 0.01
South Sound Bank      
Business Acquisition [Line Items]      
Shares outstanding (shares) 1,213,027    
Business combination, number of shares transferred (shares) 904,918    
Business combination, consideration transferred $ 7    
Common stock value (in dollars per share) $ 0.7460    
Business combination, share price (dollars per share) $ 5.68825