Loans Receivable - Carrying Value Of Collateral Dependent Individually Analyzed Loans (Detail) - USD ($) $ in Thousands			12 Months Ended
		Jul. 10, 2020	Jun. 30, 2022	Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		$ 3,901
Individually Analyzed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans			$ 63,287	$ 59,243
Balance			3,622	6,512
Individually Analyzed Loans [Member] | One-to Four-Family Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	[1]		4,305	7,612
Balance	[1]		77	420
Individually Analyzed Loans [Member] | Home Equity Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	[1]		35	31
Balance	[1]		0
Individually Analyzed Loans [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans			58,947	51,600
Balance			3,545	6,092
Individually Analyzed Loans [Member] | Commercial Loan [Member] | Non-Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	[2]		30,733	32,891
Balance	[2]		2,696	4,724
Individually Analyzed Loans [Member] | Commercial Loan [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	[3]			183
Individually Analyzed Loans [Member] | Commercial Loan [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans			1,561
Individually Analyzed Loans [Member] | Multi-Family Mortgage [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans			26,653	18,526
Balance			$ 849	$ 1,368

[1] Secured by one- to four-family residential properties.

[2] Secured by income-producing nonresidential property.

[3] Secured by business assets.