Loans and Allowance for Credit Losses - Loan portfolio aging analysis (Details) $ in Thousands	Mar. 31, 2024 USD ($) loan	Jun. 30, 2023 USD ($) loan
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 3,771,445	$ 3,619,197
Greater than 90 Days Past Due and Accruing	$ 81	$ 109
Number of PCD loans greater than 90 days past due | loan	0	0
Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 8,640	$ 10,741
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	4,404	4,212
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,122	2,767
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,114	3,762
Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,762,805	3,608,456
Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,200,723	1,133,417
Greater than 90 Days Past Due and Accruing	81	109
Residential Real Estate | Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,281	2,868
Residential Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,068	1,984
Residential Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	334	401
Residential Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	879	483
Residential Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,198,442	1,130,549
Construction Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	205,061	190,856
Construction Real Estate | Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	555	1,452
Construction Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	486	443
Construction Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	69	311
Construction Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		698
Construction Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	204,506	189,404
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,608,935	1,562,379
Commercial Real Estate | Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,683	4,050
Commercial Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	442	616
Commercial Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	129	1,854
Commercial Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,112	1,580
Commercial Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,607,252	1,558,329
Consumer loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	140,123	133,515
Consumer loans | Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,245	792
Consumer loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	795	456
Consumer loans | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	257	124
Consumer loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	193	212
Consumer loans | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	138,878	132,723
Commercial loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	616,603	599,030
Commercial loans | Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,876	1,579
Commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,613	713
Commercial loans | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	333	77
Commercial loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	930	789
Commercial loans | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 613,727	$ 597,451