Business Combinations - Summary of pro forma information (Details) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition, Pro Forma Information [Abstract]
Net interest income		$ 21,540	$ 14,799
Provision for loan losses		133	626
Non-interest income		2,311	2,160
Non-interest expense		(18,992)	(15,392)
Pre-tax income		4,726	941
Income tax expense (benefit)		$ 947	(387)
Washington
Business Acquisition, Pro Forma Information [Abstract]
Pre-tax income	$ 30
Net income	$ 24
Pro Forma | Fidelity
Business Acquisition, Pro Forma Information [Abstract]
Net interest income			17,352	$ 17,478
Provision for loan losses			(695)	(105)
Non-interest income			1,672	1,915
Non-interest expense			(16,005)	(14,819)
Pre-tax income			2,324	4,469
Income tax expense (benefit)			488	938
Net income			$ 1,836	$ 3,531
Earnings per share basic			$ 0.13	$ 0.24
Earnings per share diluted			$ 0.13	$ 0.24
Pro Forma | Washington
Business Acquisition, Pro Forma Information [Abstract]
Net interest income			$ 19,112	$ 20,149
Provision for loan losses			(752)	(196)
Non-interest income			2,409	1,715
Non-interest expense			(17,392)	(18,223)
Pre-tax income			3,377	3,445
Income tax expense (benefit)			709	723
Net income			$ 2,668	$ 2,722
Earnings per share basic			$ 0.18	$ 0.19
Earnings per share diluted			$ 0.18	$ 0.19