Deposits - Weighted-average interest rates (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Deposits.
Non-interest bearing checking	$ 60,872	$ 75,758
Interest bearing checking	116,700	122,675
Money market accounts	208,020	171,316
Savings and club accounts	90,291	105,507
Certificates of deposit	159,377	131,361
Total deposits	$ 635,260	$ 606,617
Weighted Average Rate
Interest bearing checking	0.91%	0.13%
Money market accounts	2.77%	0.30%
Savings and club accounts	0.05%	0.05%
Certificates of deposit	2.30%	0.89%
Total deposits	1.66%	0.31%