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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Net income	$ 6,335	$ 5,956	$ 6,114	$ 5,615	$ 4,422	$ 4,416	$ 4,269	$ 3,614	$ 24,020	$ 16,721	$ 14,167
Basic (in dollars per share)	$ 0.76	$ 0.71	$ 0.74	$ 0.68	$ 0.60	$ 0.60	$ 0.58	$ 0.49	$ 2.89	$ 2.28	$ 1.99
Diluted (in dollars per share)	$ 0.75	$ 0.70	$ 0.72	$ 0.66	$ 0.59	$ 0.59	$ 0.57	$ 0.48	$ 2.84	$ 2.22	$ 1.92
Pro Forma | South Sound Merger
Business Acquisition [Line Items]
Total revenues (net interest income plus non-interest income)									$ 65,501	$ 59,184
Net income									$ 24,385	$ 18,825
Basic (in dollars per share)									$ 2,930.00	$ 2,280.00
Diluted (in dollars per share)									$ 2,880.00	$ 2,230.00

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