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Loans Receivable - Troubled Debt Restructurings of Loans Receivable (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($) loan
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		62
Financing receivable, Modified, Accumulated		$ 17,361
Financing receivable, excluding accrued interest, modified in period, amount	$ 4,635
Financing receivable, excluding accrued interest, modified in period, to total financing receivables, percent	0.08%
# of Loans | loan		6
Pre-modification Recorded Investment		$ 1,130
Post-modification Recorded Investment		$ 1,159
Payment Deferral
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	$ 3,779
Extended Maturity
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	856
Performing
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		54
Financing receivable, Modified, Accumulated		$ 10,487
Nonperforming
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		8
Financing receivable, Modified, Accumulated		$ 6,874
Commercial loans:
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		13
Financing receivable, Modified, Accumulated		$ 9,467
Commercial loans: | Performing
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		9
Financing receivable, Modified, Accumulated		$ 3,367
Commercial loans: | Nonperforming
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		4
Financing receivable, Modified, Accumulated		$ 6,100
Commercial loans: | Multi-family mortgage
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		2
Financing receivable, Modified, Accumulated		$ 5,400
Financing receivable, excluding accrued interest, modified in period, amount	$ 2,774
Financing receivable, excluding accrued interest, modified in period, to total financing receivables, percent	0.10%
Commercial loans: | Multi-family mortgage | Payment Deferral
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	$ 2,774
Commercial loans: | Multi-family mortgage | Extended Maturity
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	0
Commercial loans: | Multi-family mortgage | Performing
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		0
Financing receivable, Modified, Accumulated		$ 0
Commercial loans: | Multi-family mortgage | Nonperforming
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		2
Financing receivable, Modified, Accumulated		$ 5,400
Commercial loans: | Nonresidential mortgage
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		5
Financing receivable, Modified, Accumulated		$ 870
Financing receivable, excluding accrued interest, modified in period, amount	$ 786
Financing receivable, excluding accrued interest, modified in period, to total financing receivables, percent	0.08%
# of Loans | loan		1
Pre-modification Recorded Investment		$ 313
Post-modification Recorded Investment		$ 345
Commercial loans: | Nonresidential mortgage | Payment Deferral
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	$ 0
Commercial loans: | Nonresidential mortgage | Extended Maturity
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	786
Commercial loans: | Nonresidential mortgage | Performing
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		3
Financing receivable, Modified, Accumulated		$ 170
Commercial loans: | Nonresidential mortgage | Nonperforming
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		2
Financing receivable, Modified, Accumulated		$ 700
Commercial loans: | Commercial business
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		6
Financing receivable, Modified, Accumulated		$ 3,197
Financing receivable, excluding accrued interest, modified in period, amount	$ 45
Financing receivable, excluding accrued interest, modified in period, to total financing receivables, percent	0.03%
# of Loans | loan		2
Pre-modification Recorded Investment		$ 74
Post-modification Recorded Investment		$ 74
Commercial loans: | Commercial business | Payment Deferral
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	$ 45
Commercial loans: | Commercial business | Extended Maturity
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	0
Commercial loans: | Commercial business | Performing
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		6
Financing receivable, Modified, Accumulated		$ 3,197
Commercial loans: | Commercial business | Nonperforming
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		0
Financing receivable, Modified, Accumulated		$ 0
Commercial loans: | Construction
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		0
Financing receivable, Modified, Accumulated		$ 0
Commercial loans: | Construction | Performing
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		0
Financing receivable, Modified, Accumulated		$ 0
Commercial loans: | Construction | Nonperforming
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		0
Financing receivable, Modified, Accumulated		$ 0
One- to four-family residential mortgage
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		43
Financing receivable, Modified, Accumulated		$ 7,526
Financing receivable, excluding accrued interest, modified in period, amount	$ 1,005
Financing receivable, excluding accrued interest, modified in period, to total financing receivables, percent	0.06%
# of Loans | loan		2
Pre-modification Recorded Investment		$ 708
Post-modification Recorded Investment		$ 705
One- to four-family residential mortgage | Payment Deferral
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	$ 960
One- to four-family residential mortgage | Extended Maturity
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	45
One- to four-family residential mortgage | Performing
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		39
Financing receivable, Modified, Accumulated		$ 6,752
One- to four-family residential mortgage | Nonperforming
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		4
Financing receivable, Modified, Accumulated		$ 774
Consumer loans: | Home equity loans
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		6
Financing receivable, Modified, Accumulated		$ 368
Financing receivable, excluding accrued interest, modified in period, amount	$ 25
Financing receivable, excluding accrued interest, modified in period, to total financing receivables, percent	0.06%
# of Loans | loan		1
Pre-modification Recorded Investment		$ 35
Post-modification Recorded Investment		$ 35
Consumer loans: | Home equity loans | Payment Deferral
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	$ 0
Consumer loans: | Home equity loans | Extended Maturity
Financing Receivable Modifications [Line Items]
Financing receivable, excluding accrued interest, modified in period, amount	$ 25
Consumer loans: | Home equity loans | Performing
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		6
Financing receivable, Modified, Accumulated		$ 368
Consumer loans: | Home equity loans | Nonperforming
Financing Receivable Modifications [Line Items]
Financing receivable, Modifications, Accumulated | loan		0
Financing receivable, Modified, Accumulated		$ 0

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