Nature of Operations and Summary of Significant Accounting Policies - Schedule of Impact of ASU 2016-13 Adoption (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Jul. 01, 2022	Jun. 30, 2022	Jun. 30, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	$ 7,139		$ 7,052	$ 6,599
Allowance for credit losses on off-balance sheet exposure	216	$ 496,000	0
Allowance For Credit Losses As Reported Under ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		7,099
Allowance for credit losses on off-balance sheet exposure		496
Allowance For Credit Loss Before ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		7,052
Allowance for credit losses on off-balance sheet exposure		0
Impact On Allowance Of ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		47
Allowance for credit losses on off-balance sheet exposure		496
Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	794		2,025	1,740
Commercial Portfolio Segment [Member] \| Allowance For Credit Losses As Reported Under ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		1,207
Commercial Portfolio Segment [Member] \| Allowance For Credit Loss Before ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		2,025
Commercial Portfolio Segment [Member] \| Impact On Allowance Of ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		(818)
Consumer Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	71		80	62
Consumer Portfolio Segment [Member] \| Allowance For Credit Losses As Reported Under ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		93
Consumer Portfolio Segment [Member] \| Allowance For Credit Loss Before ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		80
Consumer Portfolio Segment [Member] \| Impact On Allowance Of ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		13
Real Estate Loans One To Four Family Including Home Equity Loans [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	1,898		1,028	967
Real Estate Loans One To Four Family Including Home Equity Loans [Member] \| Allowance For Credit Losses As Reported Under ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		1,410
Real Estate Loans One To Four Family Including Home Equity Loans [Member] \| Allowance For Credit Loss Before ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		1,028
Real Estate Loans One To Four Family Including Home Equity Loans [Member] \| Impact On Allowance Of ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		382
Real Estate Loans Multi Family [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	1,121		1,375	1,674
Real Estate Loans Multi Family [Member] \| Allowance For Credit Losses As Reported Under ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		1,235
Real Estate Loans Multi Family [Member] \| Allowance For Credit Loss Before ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		1,375
Real Estate Loans Multi Family [Member] \| Impact On Allowance Of ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		(140)
Commercial Real Estate Portfolio Segment [Member] \| Allowance For Credit Losses As Reported Under ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		2,370
Commercial Real Estate Portfolio Segment [Member] \| Allowance For Credit Loss Before ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		1,985
Commercial Real Estate Portfolio Segment [Member] \| Impact On Allowance Of ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		385
Real Estate Loans Home Equity Lines Of Credit [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	121		70	67
Real Estate Loans Home Equity Lines Of Credit [Member] \| Allowance For Credit Losses As Reported Under ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		103
Real Estate Loans Home Equity Lines Of Credit [Member] \| Allowance For Credit Loss Before ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		70
Real Estate Loans Home Equity Lines Of Credit [Member] \| Impact On Allowance Of ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		33
Construction Loans [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	$ 765		$ 489	$ 258
Construction Loans [Member] \| Allowance For Credit Losses As Reported Under ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		681
Construction Loans [Member] \| Allowance For Credit Loss Before ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		489
Construction Loans [Member] \| Impact On Allowance Of ASU 2016-13 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		$ 192