Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Additional Information (Details)	3 Months Ended
	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Derivative [Line Items]
Commitments to extend credit	$ 6,900,000		$ 7,400,000
Outstanding derivative financial instruments	$ 0		0
Number Of Loans Repurchased | loan	0	1
Loan Repurchased, Bank		$ 566,000
Recourse Liability	$ 370,000	$ 250,000	270,000	$ 250,000
Other Investors
Derivative [Line Items]
Recourse Liability	300,000		200,000
FHLB - San Francisco [Member]
Derivative [Line Items]
Recourse Liability	$ 70,000		$ 70,000