Loans and Allowance for Credit Losses - Loan portfolio aging analysis (Details) $ in Thousands	Dec. 31, 2023 USD ($) loan	Jun. 30, 2023 USD ($) loan
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 3,732,153	$ 3,619,197
Greater than 90 Days Past Due and Accruing		$ 109
Number of PCD loans greater than 90 days past due | loan	0	0
Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 3,723,846	$ 3,608,456
Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	8,307	10,741
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,874	4,212
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,158	2,767
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,275	3,762
Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,160,264	1,133,417
Greater than 90 Days Past Due and Accruing		109
Residential Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,157,329	1,130,549
Residential Real Estate | Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,935	2,868
Residential Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,970	1,984
Residential Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	348	401
Residential Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	617	483
Construction Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	244,227	190,856
Construction Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	243,987	189,404
Construction Real Estate | Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	240	1,452
Construction Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	240	443
Construction Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		311
Construction Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		698
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,558,600	1,562,379
Commercial Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,556,081	1,558,329
Commercial Real Estate | Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,519	4,050
Commercial Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,208	616
Commercial Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	275	1,854
Commercial Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	36	1,580
Consumer loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	139,163	133,515
Consumer loans | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	137,962	132,723
Consumer loans | Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,201	792
Consumer loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	857	456
Consumer loans | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	171	124
Consumer loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	173	212
Commercial loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	629,899	599,030
Commercial loans | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	628,487	597,451
Commercial loans | Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,412	1,579
Commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	599	713
Commercial loans | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	364	77
Commercial loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 449	$ 789