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Goodwill and CDI - Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Goodwill [Roll Forward]    
Balance at the beginning of the period $ 15,131 $ 5,650
Addition as a result of the South Sound Merger (see Note 2) 9,481  
Balance at the end of the period $ 15,131