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Business Combinations - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 01, 2018	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Business combination, number of shares transferred (shares)				904,826
Goodwill acquired				$ 9,481
South Sound Merger
Business Acquisition [Line Items]
Business combination, number of shares transferred (shares)	904,826
Issued, value assigned	$ 28,270
Business combination, share price (dollars per share)	$ 31.24
Cash paid	$ 6,900
Total merger consideration	35,170
Goodwill acquired	$ 9,480
Acquisition related costs			$ 328	$ 447	$ 317
Timberland Bank | South Sound Merger
Business Acquisition [Line Items]
Shares issued (in dollars per share)	$ 0.746
South Sound Bank | South Sound Merger
Business Acquisition [Line Items]
Shares issued (in dollars per share)	$ 5.68825
Acquisition related costs					$ 143
Forecast | South Sound Merger
Business Acquisition [Line Items]
Acquisition related costs		$ 450

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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Per share or per unit amount of equity securities issued.

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