Loans - Loan Delinquencies and Non-accrual Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 5,970		$ 5,970		$ 4,421
Current	495,684		495,684		512,725
Total Loans Receivable	501,909		501,909		517,467
Recorded Investment > 90 Days and Accruing					90
Recorded Investment Loans on Non-Accrual	5,085		5,085		3,172
Interest income	120	$ 60	10	$ 21
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,673		1,673		464
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,198		2,198		2,114
90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Past Due	2,099		2,099		1,843
Acquired credit impaired
Financing Receivable, Past Due [Line Items]
Total Past Due	255		255		321
Residential real estate | 1-4 Family
Financing Receivable, Past Due [Line Items]
Total Past Due	4,723		4,723		2,732
Current	320,773		320,773		342,884
Total Loans Receivable	325,728		325,728		345,915
Recorded Investment Loans on Non-Accrual	3,768		3,768		2,353
Residential real estate | 1-4 Family | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,622		1,622		235
Residential real estate | 1-4 Family | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,594		1,594		1,020
Residential real estate | 1-4 Family | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Past Due	1,507		1,507		1,477
Residential real estate | 1-4 Family | Acquired credit impaired
Financing Receivable, Past Due [Line Items]
Total Past Due	232		232		299
Residential real estate | Home equity and HELOCs
Financing Receivable, Past Due [Line Items]
Total Past Due	448		448		408
Current	44,622		44,622		46,624
Total Loans Receivable	45,093		45,093		47,054
Recorded Investment > 90 Days and Accruing					90
Recorded Investment Loans on Non-Accrual	449		449		384
Residential real estate | Home equity and HELOCs | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due					126
Residential real estate | Home equity and HELOCs | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	101		101		101
Residential real estate | Home equity and HELOCs | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Past Due	347		347		181
Residential real estate | Home equity and HELOCs | Acquired credit impaired
Financing Receivable, Past Due [Line Items]
Total Past Due	23		23		22
Residential real estate | Construction Residential
Financing Receivable, Past Due [Line Items]
Current	13,581		13,581		15,799
Total Loans Receivable	13,581		13,581		15,799
Commercial real estate | Multi-family
Financing Receivable, Past Due [Line Items]
Total Past Due	183		183		650
Current	12,040		12,040		14,314
Total Loans Receivable	12,223		12,223		14,964
Recorded Investment Loans on Non-Accrual	183		183		185
Commercial real estate | Multi-family | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due					465
Commercial real estate | Multi-family | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Past Due	183		183		185
Commercial real estate | Commercial non-residential
Financing Receivable, Past Due [Line Items]
Total Past Due	554		554		607
Current	89,398		89,398		76,100
Total Loans Receivable	89,952		89,952		76,707
Recorded Investment Loans on Non-Accrual	555		555		135
Commercial real estate | Commercial non-residential | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	51		51		100
Commercial real estate | Commercial non-residential | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	503		503		507
Commercial real estate | Construction and Land
Financing Receivable, Past Due [Line Items]
Current	5,818		5,818		6,690
Total Loans Receivable	5,818		5,818		6,690
Commercial
Financing Receivable, Past Due [Line Items]
Current	6,027		6,027		6,438
Total Loans Receivable	6,027		6,027		6,438
Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	62		62		24
Current	3,425		3,425		3,876
Total Loans Receivable	3,487		3,487		3,900
Recorded Investment Loans on Non-Accrual	130		130		115
Consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due					3
Consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due					$ 21
Consumer | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 62		$ 62