Loans Receivable - Troubled Debt Restructurings of Loans Receivable (Details) - Troubled Debt Restructurings [Member] $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022 USD ($) Loan	Mar. 31, 2021 USD ($) Loan	Mar. 31, 2022 USD ($) Loan	Mar. 31, 2021 USD ($) Loan	Jun. 30, 2021 USD ($) Loan
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	69		69		63
Number of Loans | Loan	11	1	14	2
Amount	$ 31,699		$ 31,699		$ 17,800
Pre-modification outstanding recorded investment	13,534	$ 24	16,782	$ 333
Post-modification outstanding recorded investment	$ 13,543	$ 24	$ 16,776	$ 332
One-to Four-Family Residential Mortgage [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	44		44		38
Number of Loans | Loan	8		10	1
Amount	$ 7,662		$ 7,662		$ 5,621
Pre-modification outstanding recorded investment	2,953		3,214	$ 309
Post-modification outstanding recorded investment	$ 2,965		$ 3,226	$ 308
Home Equity Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	7		7		7
Number of Loans | Loan	2	1	2	1
Amount	$ 1,566		$ 1,566		$ 227
Pre-modification outstanding recorded investment	1,477	$ 24	1,477	$ 24
Post-modification outstanding recorded investment	$ 1,477	$ 24	$ 1,477	$ 24
Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	18		18		18
Amount	$ 22,471		$ 22,471		$ 11,952
Accrual [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	43		43		26
Amount	$ 8,544		$ 8,544		$ 6,235
Accrual [Member] | One-to Four-Family Residential Mortgage [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	29		29		18
Amount	$ 4,270		$ 4,270		$ 2,216
Accrual [Member] | Home Equity Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	5		5		4
Amount	$ 170		$ 170		$ 159
Accrual [Member] | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	9		9		4
Amount	$ 4,104		$ 4,104		$ 3,860
Non-accrual [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	26		26		37
Amount	$ 23,155		$ 23,155		$ 11,565
Non-accrual [Member] | One-to Four-Family Residential Mortgage [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	15		15		20
Amount	$ 3,392		$ 3,392		$ 3,405
Non-accrual [Member] | Home Equity Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	2		2		3
Amount	$ 1,396		$ 1,396		$ 68
Non-accrual [Member] | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	9		9		14
Amount	$ 18,367		$ 18,367		$ 8,092
Non-Residential Mortgage [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	6		6
Non-Residential Mortgage [Member] | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan					7
Amount	$ 2,046		$ 2,046		$ 2,380
Non-Residential Mortgage [Member] | Accrual [Member] | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	4		4		1
Amount	$ 400		$ 400		$ 105
Non-Residential Mortgage [Member] | Non-accrual [Member] | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	2		2		6
Amount	$ 1,646		$ 1,646		$ 2,275
Commercial Business [Member] | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	8		8		9
Amount	$ 4,029		$ 4,029		$ 4,448
Commercial Business [Member] | Accrual [Member] | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	5		5		3
Amount	$ 3,704		$ 3,704		$ 3,755
Commercial Business [Member] | Non-accrual [Member] | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	3		3		6
Amount	$ 325		$ 325		$ 693
Construction [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	1		1
Construction [Member] | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan					1
Amount	$ 1,791		$ 1,791		$ 2,228
Construction [Member] | Non-accrual [Member] | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	1		1		1
Amount	$ 1,791		$ 1,791		$ 2,228
Multi-Family Mortgage Member
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	1		2
Pre-modification outstanding recorded investment	$ 9,104		$ 12,091
Post-modification outstanding recorded investment	$ 9,101		$ 12,073
Multi-Family Mortgage Member | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	3		3		1
Amount	$ 14,605		$ 14,605		$ 2,896
Multi-Family Mortgage Member | Non-accrual [Member] | Commercial Loan [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	3		3		1
Amount	$ 14,605		$ 14,605		$ 2,896