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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Net income	$ 5,956	$ 4,416	$ 17,685	$ 12,299
Basic (in dollars per share)	$ 0.71	$ 0.60	$ 2.13	$ 1.68
Diluted (in dollars per share)	$ 0.70	$ 0.59	$ 2.09	$ 1.64
Pro Forma | South Sound Merger
Business Acquisition [Line Items]
Total revenues (net interest income plus non-interest income)			$ 48,754	$ 43,958
Net income			$ 18,038	$ 13,824
Basic (in dollars per share)			$ 2.17	$ 1.68
Diluted (in dollars per share)			$ 2.13	$ 1.64

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