New Accounting Pronouncements - Schedule Of Impact Of ASU 2016-13 Adoption (Detail) - USD ($)	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Jul. 01, 2022	Jun. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	$ 7,450,000	$ 7,139,000	$ 7,023,000		$ 7,052,000
Off-Balance-Sheet, Credit Loss, Liability	129,000	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]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	788,000	794,000	1,090,000		2,025,000
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]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	77,000	71,000	83,000		80,000
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]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	1,906,000	1,898,000	1,537,000		1,028,000
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]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	1,115,000	1,121,000	1,284,000		1,375,000
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]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	134,000	121,000	94,000		70,000
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]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	$ 1,165,000	$ 765,000	$ 549,000		$ 489,000
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