Fair Value of Financial Instruments - Quantitative Information (Details) $ in Thousands	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Assets at fair value
Fair value estimate	$ 0
Non-recurring basis
Assets at fair value
Fair value estimate	75	$ 290
Non-recurring basis | Level 3
Assets at fair value
Fair value estimate	$ 75	290
Non-recurring basis | Impaired loans
Assets at fair value
Fair value estimate		190
Non-recurring basis | Impaired loans | Level 3
Assets at fair value
Fair value estimate		190
Non-recurring basis | Impaired loans | Level 3 | Appraisal adjustments
Assets at fair value
Fair value estimate		$ 190
Non-recurring basis | Impaired loans | Level 3 | Appraisal adjustments | Minimum
Assets at fair value
Measurement input	0
Non-recurring basis | Impaired loans | Level 3 | Appraisal adjustments | Maximum
Assets at fair value
Measurement input		28
Non-recurring basis | Other real estate owned
Assets at fair value
Fair value estimate	$ 75	$ 100
Non-recurring basis | Other real estate owned | Level 3
Assets at fair value
Fair value estimate	75	100
Non-recurring basis | Other real estate owned | Level 3 | Liquidation expenses
Assets at fair value
Fair value estimate	$ 75	$ 100
Measurement input	0	0