New Accounting Pronouncements - Schedule Of Impact Of ASU 2016-13 Adoption (Detail) - USD ($)	Dec. 31, 2023	Jun. 30, 2023	Jul. 01, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-Balance-Sheet, Credit Loss, Liability	$ 56,000	$ 216,000
Allowance For Credit Losses As Reported Under ASU 201613 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			$ 7,099,000
Off-Balance-Sheet, Credit Loss, Liability			496,000
Allowance For Credit Loss Before ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			7,052,000
Off-Balance-Sheet, Credit Loss, Liability			0
Impact On Allowance Of ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			47,000
Off-Balance-Sheet, Credit Loss, Liability			496,000
Commercial Portfolio Segment [Member] | Allowance For Credit Losses As Reported Under ASU 201613 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			1,207,000
Commercial Portfolio Segment [Member] | Allowance For Credit Loss Before ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			2,025,000
Commercial Portfolio Segment [Member] | Impact On Allowance Of ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			(818,000)
Consumer Portfolio Segment [Member] | Allowance For Credit Losses As Reported Under ASU 201613 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			93,000
Consumer Portfolio Segment [Member] | Allowance For Credit Loss Before ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			80,000
Consumer Portfolio Segment [Member] | Impact On Allowance Of ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			13,000
Real Estate Loans One To Four Family Including Home Equity Loans [Member] | Allowance For Credit Losses As Reported Under ASU 201613 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			1,410,000
Real Estate Loans One To Four Family Including Home Equity Loans [Member] | Allowance For Credit Loss Before ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			1,028,000
Real Estate Loans One To Four Family Including Home Equity Loans [Member] | Impact On Allowance Of ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			382,000
Real Estate Loans Multi Family [Member] | Allowance For Credit Losses As Reported Under ASU 201613 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			1,235,000
Real Estate Loans Multi Family [Member] | Allowance For Credit Loss Before ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			1,375,000
Real Estate Loans Multi Family [Member] | Impact On Allowance Of ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			(140,000)
Commercial Real Estate Portfolio Segment [Member] | Allowance For Credit Losses As Reported Under ASU 201613 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			2,370,000
Commercial Real Estate Portfolio Segment [Member] | Allowance For Credit Loss Before ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			1,985,000
Commercial Real Estate Portfolio Segment [Member] | Impact On Allowance Of ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			385,000
Real Estate Loans Home Equity Lines Of Credit [Member] | Allowance For Credit Losses As Reported Under ASU 201613 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			103,000
Real Estate Loans Home Equity Lines Of Credit [Member] | Allowance For Credit Loss Before ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			70,000
Real Estate Loans Home Equity Lines Of Credit [Member] | Impact On Allowance Of ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			33,000
Construction Loans [Member] | Allowance For Credit Losses As Reported Under ASU 201613 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			681,000
Construction Loans [Member] | Allowance For Credit Loss Before ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			489,000
Construction Loans [Member] | Impact On Allowance Of ASU 201613 Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			$ 192,000