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Business Combinations - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |
Goodwill acquired |  | $ 9,481 |
South Sound Merger |  |  |
Business Acquisition [Line Items] |  |  |
Shares issued (shares) | 904,826 |  |
Issued, value assigned | $ 28,267 |  |
Business combination, share price (dollars per share) | $ 31.24 |  |
Cash paid | $ 6,903 |  |
Total merger consideration | 35,170 |  |
Goodwill acquired | $ 9,481 |  |
Acquisition related costs |  | 462 | $ 616
Timberland Bank | South Sound Merger |  |  |
Business Acquisition [Line Items] |  |  |
Shares issued (in dollars per share) | $ 0.746 |  |
South Sound Bank |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition related costs |  |  | $ 1,598
South Sound Bank | South Sound Merger |  |  |
Business Acquisition [Line Items] |  |  |
Shares issued (in dollars per share) | $ 5.68825 |  |
Data processing and telecommunications | South Sound Merger |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition related costs |  | 317 |
Professional fees | South Sound Bank | South Sound Merger |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition related costs |  | $ 145 |

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