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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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