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Goodwill and CDI - CDI (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward]    
Amortization $ (109) $ 0
Core Deposits    
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the period 0  
Addition as a result of the South Sound Merger (see Note 2) 2,483  
Amortization (109)  
Balance at the end of the period $ 2,374