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Business Combinations - Net Effect of Acquisition (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Business Acquisition [Line Items]        
Interest income: Interest and fees on loans $ 12,459 $ 9,530 $ 36,457 $ 28,342
Interest expense (1,248) (730) (3,332) (1,996)
Non-interest income 3,538 3,145 10,744 9,364
Non-interest expense (8,967) $ (7,122) (26,807) (21,519)
Accretion of discount on purchased loans     (457) 0
South Sound Merger        
Business Acquisition [Line Items]        
Interest income: Interest and fees on loans 1,739   5,345  
Interest income: Interest and dividends on investment securities and FHLB stock 129   515  
Interest income: Other interest earning assets 205   474  
Interest expense (200)   (484)  
Provision for loan losses 0   0  
Non-interest income 138   408  
Non-interest expense (1,002)   (2,546)  
Net effect, pre-tax 1,009   3,712  
Accretion of discount on purchased loans 69   457  
Acquisition related costs $ 328   $ 447 $ 317