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Loans Receivable (Details) - Schedule of allowance for loan losses and the recorded investment in loans by portfolio - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Residential real estate:
Unpaid principal balance and recorded investment	$ 292,045	$ 287,375
Ending allowance attributed to loan	1,336	1,288
Unallocated allowance	200	200
Total allowance	1,536	1,488
Loans individually evaluated for impairment [Member]
Residential real estate:
Loans individually evaluated	5,568	5,686
Loans acquired with deteriorated credit quality	736	751
Unpaid principal balance and recorded investment	6,304	6,437
Ending allowance attributed to loan
Unallocated allowance
Total allowance
Loans individually evaluated for impairment [Member] | One-to four-family [Member]
Residential real estate:
Loans individually evaluated	3,894	3,983
Loans acquired with deteriorated credit quality	736	751
Unpaid principal balance and recorded investment	4,630	4,734
Ending allowance attributed to loan
Unallocated allowance
Total allowance
Loans individually evaluated for impairment [Member] | Multi-family [Member]
Residential real estate:
Loans individually evaluated	665	671
Loans acquired with deteriorated credit quality
Unpaid principal balance and recorded investment	665	671
Ending allowance attributed to loan
Unallocated allowance
Total allowance
Loans individually evaluated for impairment [Member] | Construction [Member]
Residential real estate:
Loans individually evaluated	63	63
Loans acquired with deteriorated credit quality
Unpaid principal balance and recorded investment	63	63
Ending allowance attributed to loan
Unallocated allowance
Total allowance
Loans individually evaluated for impairment [Member] | Farm [Member]
Residential real estate:
Loans individually evaluated	292	309
Loans acquired with deteriorated credit quality
Unpaid principal balance and recorded investment	292	309
Ending allowance attributed to loan
Unallocated allowance
Total allowance
Loans individually evaluated for impairment [Member] | Nonresidential real estate [Member]
Residential real estate:
Loans individually evaluated	654	660
Loans acquired with deteriorated credit quality
Unpaid principal balance and recorded investment	654	660
Ending allowance attributed to loan
Unallocated allowance
Total allowance
Loans collectively evaluated for impairment [Member]
Residential real estate:
Unpaid principal balance and recorded investment	285,741	280,938
Ending allowance attributed to loan	1,336	1,288
Unallocated allowance	200	200
Total allowance	1,536	1,488
Loans collectively evaluated for impairment [Member] | One-to four-family [Member]
Residential real estate:
Unpaid principal balance and recorded investment	217,029	217,755
Ending allowance attributed to loan	670	671
Unallocated allowance
Total allowance	670	671
Loans collectively evaluated for impairment [Member] | Multi-family [Member]
Residential real estate:
Unpaid principal balance and recorded investment	13,838	11,702
Ending allowance attributed to loan	217	184
Unallocated allowance
Total allowance	217	184
Loans collectively evaluated for impairment [Member] | Construction [Member]
Residential real estate:
Unpaid principal balance and recorded investment	4,706	3,982
Ending allowance attributed to loan	7	6
Unallocated allowance
Total allowance	7	6
Loans collectively evaluated for impairment [Member] | Farm [Member]
Residential real estate:
Unpaid principal balance and recorded investment	2,214	2,045
Ending allowance attributed to loan	5	4
Unallocated allowance
Total allowance	5	4
Loans collectively evaluated for impairment [Member] | Nonresidential real estate [Member]
Residential real estate:
Unpaid principal balance and recorded investment	35,027	32,843
Ending allowance attributed to loan	418	405
Unallocated allowance
Total allowance	418	405
Loans collectively evaluated for impairment [Member] | Land [Member]
Residential real estate:
Unpaid principal balance and recorded investment	912	765
Ending allowance attributed to loan	1	1
Unallocated allowance
Total allowance	1	1
Loans collectively evaluated for impairment [Member] | Commercial nonmortgage [Member]
Residential real estate:
Unpaid principal balance and recorded investment	2,608	2,214
Ending allowance attributed to loan	4	3
Unallocated allowance
Total allowance	4	3
Loans collectively evaluated for impairment [Member] | Loans on deposits [Member]
Residential real estate:
Unpaid principal balance and recorded investment	1,280	1,245
Ending allowance attributed to loan	2	2
Unallocated allowance
Total allowance	2	2
Loans collectively evaluated for impairment [Member] | Home equity [Member]
Residential real estate:
Unpaid principal balance and recorded investment	7,396	7,645
Ending allowance attributed to loan	11	11
Unallocated allowance
Total allowance	11	11
Loans collectively evaluated for impairment [Member] | Automobile [Member]
Residential real estate:
Unpaid principal balance and recorded investment	74	67
Ending allowance attributed to loan
Unallocated allowance
Total allowance
Loans collectively evaluated for impairment [Member] | Unsecured [Member]
Residential real estate:
Unpaid principal balance and recorded investment	657	675
Ending allowance attributed to loan	1	1
Unallocated allowance
Total allowance	1	1
Loans collectively evaluated for impairment [Member] | Unallocated [Member]
Residential real estate:
Unpaid principal balance and recorded investment
Ending allowance attributed to loan
Unallocated allowance	200	200
Total allowance	$ 200	$ 200

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