Loans - Loan Delinquencies and Non-accrual Loans (Details) - USD ($)	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023
Financing Receivable, Past Due [Line Items]
Non-accrual loans secured	$ 3,500,000
Non-accrual loans unsecured	81,000
Total Loans	475,639,000	$ 475,639,000
Recorded Investment Loans on Non-Accrual	3,556,000
Total Loans			$ 480,856,000
Recorded Investment Loans on Non-Accrual			4,033,000
Interest income	49,000
Interest income		75,000
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	514,000
Total Past Due			541,000
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,645,000
Total Past Due			1,544,000
90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Loans	1,345,000
Total Past Due			1,345,000
Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	3,504,000
Total Past Due			3,430,000
Current
Financing Receivable, Past Due [Line Items]
Total Loans	472,135,000
Current			477,354,000
Acquired credit impaired
Financing Receivable, Past Due [Line Items]
Total Past Due			72,000
Residential real estate | 1-4 Family
Financing Receivable, Past Due [Line Items]
Total Loans	131,305,000	131,305,000
Recorded Investment Loans on Non-Accrual	2,033,000
Total Loans			135,046,000
Recorded Investment Loans on Non-Accrual			2,090,000
Residential real estate | 1-4 Family | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	281,000
Total Past Due			290,000
Residential real estate | 1-4 Family | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	654,000
Total Past Due			457,000
Residential real estate | 1-4 Family | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Loans	198,000
Total Past Due			567,000
Residential real estate | 1-4 Family | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,133,000
Total Past Due			1,314,000
Residential real estate | 1-4 Family | Current
Financing Receivable, Past Due [Line Items]
Total Loans	130,172,000
Current			133,660,000
Residential real estate | 1-4 Family | Acquired credit impaired
Financing Receivable, Past Due [Line Items]
Total Past Due			72,000
Residential real estate | Home equity and HELOCs
Financing Receivable, Past Due [Line Items]
Total Loans	32,497,000	32,497,000
Total Loans			32,684,000
Residential real estate | Home equity and HELOCs | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	144,000
Residential real estate | Home equity and HELOCs | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	144,000
Residential real estate | Home equity and HELOCs | Current
Financing Receivable, Past Due [Line Items]
Total Loans	32,353,000
Current			32,684,000
Residential real estate | Construction Residential
Financing Receivable, Past Due [Line Items]
Total Loans	8,813,000	8,813,000
Total Loans			9,113,000
Residential real estate | Construction Residential | Current
Financing Receivable, Past Due [Line Items]
Total Loans	8,813,000
Current			9,113,000
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans	53,200,000
Commercial real estate | 1-4 Family
Financing Receivable, Past Due [Line Items]
Total Loans		96,337,000
Commercial real estate | 1 - 4 family investor
Financing Receivable, Past Due [Line Items]
Total Loans	96,337,000
Recorded Investment Loans on Non-Accrual	111,000
Total Loans			98,160,000
Recorded Investment Loans on Non-Accrual			832,000
Commercial real estate | 1 - 4 family investor | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	89,000
Commercial real estate | 1 - 4 family investor | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	960,000
Total Past Due			752,000
Commercial real estate | 1 - 4 family investor | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Loans	39,000
Commercial real estate | 1 - 4 family investor | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,088,000
Total Past Due			752,000
Commercial real estate | 1 - 4 family investor | Current
Financing Receivable, Past Due [Line Items]
Total Loans	95,249,000
Current			97,408,000
Commercial real estate | Multi-family (five or more)
Financing Receivable, Past Due [Line Items]
Total Loans	15,258,000	15,258,000
Recorded Investment Loans on Non-Accrual	236,000
Total Loans			15,281,000
Recorded Investment Loans on Non-Accrual			251,000
Commercial real estate | Multi-family (five or more) | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due			251,000
Commercial real estate | Multi-family (five or more) | Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due			251,000
Commercial real estate | Multi-family (five or more) | Current
Financing Receivable, Past Due [Line Items]
Total Loans	15,258,000
Current			15,030,000
Commercial real estate | Commercial non-residential
Financing Receivable, Past Due [Line Items]
Total Loans	155,399,000	155,399,000
Recorded Investment Loans on Non-Accrual	1,095,000
Total Loans			157,555,000
Recorded Investment Loans on Non-Accrual			778,000
Commercial real estate | Commercial non-residential | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due			322,000
Commercial real estate | Commercial non-residential | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Loans	1,095,000
Total Past Due			778,000
Commercial real estate | Commercial non-residential | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,095,000
Total Past Due			1,100,000
Commercial real estate | Commercial non-residential | Current
Financing Receivable, Past Due [Line Items]
Total Loans	154,304,000
Current			156,455,000
Commercial real estate | Construction and land
Financing Receivable, Past Due [Line Items]
Total Loans	19,343,000	19,343,000
Total Loans			15,584,000
Commercial real estate | Construction and land | Current
Financing Receivable, Past Due [Line Items]
Total Loans	19,343,000
Current			15,584,000
Commercial
Financing Receivable, Past Due [Line Items]
Total Loans	14,759,000	14,759,000
Total Loans			15,433,000
Commercial | Current
Financing Receivable, Past Due [Line Items]
Total Loans	14,759,000
Current			15,433,000
Consumer
Financing Receivable, Past Due [Line Items]
Total Loans	1,928,000	$ 1,928,000
Recorded Investment Loans on Non-Accrual	81,000
Total Loans			2,000,000
Recorded Investment Loans on Non-Accrual			82,000
Consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	31,000
Total Past Due			13,000
Consumer | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Loans	13,000
Consumer | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	44,000
Total Past Due			13,000
Consumer | Current
Financing Receivable, Past Due [Line Items]
Total Loans	$ 1,884,000
Current			$ 1,987,000