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Business Combinations - Net Effect of Acquisition (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]        
Interest income: Interest and fees on loans $ 12,216 $ 9,484 $ 23,997 $ 18,812
Interest expense (1,113) (666) (2,084) (1,266)
Non-interest income 3,940 3,082 7,206 6,219
Non-interest expense (9,277) $ (7,221) (17,839) (14,397)
Accretion of discount on purchased loans     (388) 0
South Sound Merger        
Business Acquisition [Line Items]        
Interest income: Interest and fees on loans 1,867   3,605  
Interest income: Interest and dividends on investment securities and FHLB stock 185   386  
Interest income: Other interest earning assets 169   269  
Interest expense (155)   (283)  
Provision for loan losses 0   0  
Non-interest income 131   270  
Non-interest expense (684)   (1,544)  
Net effect, pre-tax 1,513   2,703  
Accretion of discount on purchased loans 301   388  
Acquisition related costs $ 55   $ 119 $ 89