Fair Value of Financial Instruments - Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Investments available for sale:
Fair value of securities	$ 112,909	$ 89,998
Mortgage-backed securities
Investments available for sale:
Fair value of securities	55,505	51,738
U.S. agency collateralized mortgage obligations
Investments available for sale:
Fair value of securities	1,983	3,215
U.S. government agency securities
Investments available for sale:
Fair value of securities	10,917	6,155
U.S treasury securities
Investments available for sale:
Fair value of securities		1,000
Municipal bonds
Investments available for sale:
Fair value of securities	22,578	10,508
Corporate bonds
Investments available for sale:
Fair value of securities	21,926	17,382
Recurring
Investments available for sale:
Fair value of securities	112,909	89,998
Recurring | Mortgage-backed securities
Investments available for sale:
Fair value of securities	55,505	51,738
Recurring | U.S. agency collateralized mortgage obligations
Investments available for sale:
Fair value of securities	1,983	3,215
Recurring | U.S. government agency securities
Investments available for sale:
Fair value of securities	10,917	6,155
Recurring | U.S treasury securities
Investments available for sale:
Fair value of securities		1,000
Recurring | Municipal bonds
Investments available for sale:
Fair value of securities	22,578	10,508
Recurring | Corporate bonds
Investments available for sale:
Fair value of securities	21,926	17,382
Recurring | Level 2
Investments available for sale:
Fair value of securities	112,909	89,998
Recurring | Level 2 | Mortgage-backed securities
Investments available for sale:
Fair value of securities	55,505	51,738
Recurring | Level 2 | U.S. agency collateralized mortgage obligations
Investments available for sale:
Fair value of securities	1,983	3,215
Recurring | Level 2 | U.S. government agency securities
Investments available for sale:
Fair value of securities	10,917	6,155
Recurring | Level 2 | U.S treasury securities
Investments available for sale:
Fair value of securities		1,000
Recurring | Level 2 | Municipal bonds
Investments available for sale:
Fair value of securities	22,578	10,508
Recurring | Level 2 | Corporate bonds
Investments available for sale:
Fair value of securities	$ 21,926	$ 17,382