Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Schedule of Undisbursed Funds Commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Derivative [Line Items]
Total	$ 12,054	$ 18,991
Undisbursed loan funds - Construction loans
Derivative [Line Items]
Total	3,436	4,029
Undisbursed lines of credit - Commercial business loans
Derivative [Line Items]
Total	485	935
Undisbursed lines of credit - Consumer loans
Derivative [Line Items]
Total	443	448
Commitments to extend credit on loans to be held for investment
Derivative [Line Items]
Total	$ 7,690	$ 13,579