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Loans Receivable - Additional Information (Details)	3 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($) loan property	Jun. 30, 2023 USD ($) loan property	Jun. 30, 2022 USD ($) property loan	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable, related parties	$ 2,500,000	$ 2,500,000	$ 2,600,000
Number of new loans to related parties | loan		0	2
Loans and leases receivable, related parties, additions			$ 1,800,000
Interest income on non-accrual loans		$ 0	0	$ 0
Financing receivable, troubled debt restructuring	17,361,000	17,361,000	22,184,000
Loans acquired with deteriorated credit quality	48,734,000	48,734,000	47,058,000	58,165,000	$ 37,327,000
TDR charge-offs	$ 121,000		$ 0
Number of TDR default loans | loan	2		3
TDR defaults		649,000	$ 305,000
Financing receivable, individually evaluated for impairment	$ 42,600,000	42,600,000
Collateral Pledged
Financing Receivable Recorded Investment [Line Items]
Financing receivable, individually evaluated for impairment	$ 38,196,000	$ 38,196,000	63,287,000
Nonresidential Property
Financing Receivable Recorded Investment [Line Items]
Number of other real estate owned acquired through foreclosure | property	1	1
Single-family Property
Financing Receivable Recorded Investment [Line Items]
Aggregate carrying value of real estate owned	$ 13,000,000	$ 13,000,000
Residential Mortgage
Financing Receivable Recorded Investment [Line Items]
Number of loans in process of foreclosure | loan	3	3
Commercial Mortgage
Financing Receivable Recorded Investment [Line Items]
Number of loans in process of foreclosure | loan	6	6
Mortgage loans in process of foreclosure, carrying value	$ 9,200,000	$ 9,200,000
Residential mortgage
Financing Receivable Recorded Investment [Line Items]
Financing receivable, troubled debt restructuring	7,526,000	7,526,000	7,802,000
Loans acquired with deteriorated credit quality	10,237,000	10,237,000	$ 7,540,000	$ 9,747,000	$ 4,860,000
Number of loans in process of foreclosure | loan			7
Mortgage loans in process of foreclosure, carrying value	950,000	950,000	$ 1,500,000
Residential mortgage | Collateral Pledged
Financing Receivable Recorded Investment [Line Items]
Financing receivable, individually evaluated for impairment	2,875,000	2,875,000	4,305,000
Residential mortgage | Single-family Property
Financing Receivable Recorded Investment [Line Items]
Aggregate carrying value of real estate owned			$ 178,000
Real Estate Acquired in Satisfaction of Debt | Residential mortgage | Single-family Property
Financing Receivable Recorded Investment [Line Items]
Number of properties held | property			1
Troubled Debt Restructurings
Financing Receivable Recorded Investment [Line Items]
Loans acquired with deteriorated credit quality	$ 274,000	$ 274,000	$ 365,000

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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