Deposits - Weighted-average interest rates (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Deposits.
Non-interest bearing checking	$ 75,758	$ 51,086
Interest bearing checking	122,675	104,214
Money market accounts	171,316	136,719
Savings and club accounts	105,507	100,781
Certificates of deposit	131,361	160,303
Total deposits	$ 606,617	$ 553,103
Weighted Average Rate
Interest bearing checking	0.13%	0.08%
Money market accounts	0.30%	0.33%
Savings and club accounts	0.05%	0.10%
Certificates of deposit	0.89%	1.18%
Total deposits	0.31%	0.45%