Fair Value Measurements - Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Fair value on a recurring basis	$ 126,912	$ 110,429
US States and Political Subdivisions Debt Securities
Fair value on a recurring basis	41,988	42,783
US Government-sponsored Enterprises Debt Securities
Fair value on a recurring basis		7,270
Other Debt Obligations
Fair value on a recurring basis	7,624	5,053
Fair Value, Inputs, Level 2 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Fair value on a recurring basis	126,912	110,429
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities
Fair value on a recurring basis	41,988	42,783
Fair Value, Inputs, Level 2 | US Government-sponsored Enterprises Debt Securities
Fair value on a recurring basis		7,270
Fair Value, Inputs, Level 2 | Other Debt Obligations
Fair value on a recurring basis	$ 7,624	$ 5,053