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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Net income	$ 6,114	$ 4,269	$ 11,729	$ 7,883
Basic (in dollars per share)	$ 0.74	$ 0.58	$ 1.41	$ 1.08
Diluted (in dollars per share)	$ 0.72	$ 0.57	$ 1.39	$ 1.05
Pro Forma | South Sound Merger
Business Acquisition [Line Items]
Total revenues (net interest income plus non-interest income)			$ 32,278	$ 28,883
Net income			$ 11,823	$ 8,513
Basic (in dollars per share)			$ 1.42	$ 1.06
Diluted (in dollars per share)			$ 1.40	$ 1.03

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