Loans and Allowance for Credit Losses - Loan portfolio aging analysis (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 2,719,843	$ 2,237,091
Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,715,257	2,233,273
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	4,586	3,818
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,432	1,238
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	732	1,369
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,422	1,211
PCD loans that were greater than 90 days past due	0	0
Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	904,160	721,216
Residential Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	901,694	719,927
Residential Real Estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,466	1,289
Residential Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,402	312
Residential Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		364
Residential Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,064	613
Construction Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	134,416	134,284
Construction Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	134,416	134,254
Construction Real Estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		30
Construction Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		30
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,146,673	889,793
Commercial Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,145,354	889,056
Commercial Real Estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,319	737
Commercial Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	416	363
Commercial Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	615
Commercial Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	288	374
Consumer loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	92,996	77,674
Consumer loans | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	92,554	77,329
Consumer loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	442	345
Consumer loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	340	195
Consumer loans | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	45	66
Consumer loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	57	84
Commercial loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	441,598	414,124
Commercial loans | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	441,239	412,707
Commercial loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	359	1,417
Commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	274	368
Commercial loans | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	72	939
Commercial loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 13	$ 110