Loans and Allowance for Credit Losses - Loan portfolio aging analysis (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 3,619,197	$ 2,719,843
Greater than 90 Days Past Due and Accruing	109
Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,608,456	2,715,257
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	10,741	4,586
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	4,212	2,432
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,767	732
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,762	1,422
Purchased credit-impaired loans	0	0
Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,133,417	904,160
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	1,130,549	901,694
Residential Real Estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,868	2,466
Residential Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,984	1,402
Residential Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	401
Residential Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	483	1,064
Construction Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	190,856	134,416
Construction Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	189,404	134,416
Construction Real Estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,452
Construction Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	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	1,562,379	1,146,673
Commercial Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,558,329	1,145,354
Commercial Real Estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	4,050	1,319
Commercial Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	616	416
Commercial Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,854	615
Commercial Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,580	288
Consumer loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	133,515	92,996
Consumer loans | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	132,723	92,554
Consumer loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	792	442
Consumer loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	456	340
Consumer loans | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	124	45
Consumer loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	212	57
Commercial loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	599,030	441,598
Commercial loans | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	597,451	441,239
Commercial loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,579	359
Commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	713	274
Commercial loans | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	77	72
Commercial loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 789	$ 13