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New Accounting Pronouncements - Schedule Of Impact Of ASU 2016-13 Adoption (Detail) - USD ($)	Mar. 31, 2023	Dec. 31, 2022	Jul. 01, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	$ 7,535,000	$ 7,166,000		$ 7,052,000	$ 6,611,000	$ 6,395,000	$ 6,599,000
Off-Balance-Sheet, Credit Loss, Liability	307,000		$ 496,000	0
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	889,000	871,000		2,025,000	1,679,000	1,521,000	1,740,000
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	93,000		80,000	71,000	69,000	62,000
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	1,990,000	1,722,000		1,028,000	1,043,000	1,082,000	967,000
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	1,285,000	1,402,000		1,375,000	1,427,000	1,400,000	1,674,000
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	98,000	101,000		70,000	66,000	62,000	67,000
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	$ 686,000	$ 585,000		$ 489,000	$ 359,000	$ 299,000	$ 258,000
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

X

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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