Loans - Loan Delinquencies and Non-accrual Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 4,416		$ 5,015
Current	453,934		460,453
Total Loans	458,512		465,629
Recorded Investment Loans on Non-Accrual	5,555		5,301
Interest income	65	$ 58
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,082		1,953
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	348		1,546
90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Past Due	1,986		1,516
Acquired credit impaired
Financing Receivable, Past Due [Line Items]
Total Past Due	162		161
Residential real estate | 1-4 Family
Financing Receivable, Past Due [Line Items]
Total Past Due	2,340		3,208
Current	160,343		169,960
Total Loans	162,822		173,306
Recorded Investment Loans on Non-Accrual	3,527		3,774
Residential real estate | 1-4 Family | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	783		1,658
Residential real estate | 1-4 Family | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	293		561
Residential real estate | 1-4 Family | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Past Due	1,264		989
Residential real estate | 1-4 Family | Acquired credit impaired
Financing Receivable, Past Due [Line Items]
Total Past Due	139		138
Residential real estate | Home equity and HELOCs
Financing Receivable, Past Due [Line Items]
Total Past Due	270		288
Current	34,253		36,911
Total Loans	34,546		37,222
Recorded Investment Loans on Non-Accrual	410		345
Residential real estate | Home equity and HELOCs | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	112		58
Residential real estate | Home equity and HELOCs | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	8		150
Residential real estate | Home equity and HELOCs | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Past Due	150		80
Residential real estate | Home equity and HELOCs | Acquired credit impaired
Financing Receivable, Past Due [Line Items]
Total Past Due	23		23
Residential real estate | Construction Residential
Financing Receivable, Past Due [Line Items]
Current	10,734		10,841
Total Loans	10,734		10,841
Commercial real estate | 1 - 4 family investor
Financing Receivable, Past Due [Line Items]
Total Past Due	652		352
Current	119,968		120,229
Total Loans	120,620		120,581
Recorded Investment Loans on Non-Accrual	476		352
Commercial real estate | 1 - 4 family investor | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	252		81
Commercial real estate | 1 - 4 family investor | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Past Due	400		271
Commercial real estate | Multi-family (five or more)
Financing Receivable, Past Due [Line Items]
Total Past Due	503		520
Current	10,864		11,795
Total Loans	11,367		12,315
Recorded Investment Loans on Non-Accrual	503		176
Commercial real estate | Multi-family (five or more) | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	331
Commercial real estate | Multi-family (five or more) | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due			344
Commercial real estate | Multi-family (five or more) | 90 Days Or Greater
Financing Receivable, Past Due [Line Items]
Total Past Due	172		176
Commercial real estate | Commercial non-residential
Financing Receivable, Past Due [Line Items]
Total Past Due	584		583
Current	104,175		96,029
Total Loans	104,759		96,612
Recorded Investment Loans on Non-Accrual	522		536
Commercial real estate | Commercial non-residential | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	569		92
Commercial real estate | Commercial non-residential | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	15		491
Commercial real estate | Construction and Land
Financing Receivable, Past Due [Line Items]
Current	6,474		6,377
Total Loans	6,474		6,377
Commercial
Financing Receivable, Past Due [Line Items]
Current	4,515		5,145
Total Loans	4,515		5,145
Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	67		64
Current	2,608		3,166
Total Loans	2,675		3,230
Recorded Investment Loans on Non-Accrual	117		118
Consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	35		$ 64
Consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 32