Loans and Allowance for Credit Losses - Loan portfolio aging analysis (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2022	Jun. 30, 2022
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 2,995,364,000	$ 2,719,843,000
Greater than 90 Days Past Due and Accruing	331,000
Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,986,513,000	2,715,257,000
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	8,851,000	4,586,000
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	4,477,000	2,432,000
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,798,000	732,000
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,576,000	1,422,000
PCD loans that were greater than 90 days past due	0	0
Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,029,793,000	904,160,000
Greater than 90 Days Past Due and Accruing	331,000
Residential Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,026,336,000	901,694,000
Residential Real Estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,457,000	2,466,000
Residential Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,727,000	1,402,000
Residential Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	862,000
Residential Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	868,000	1,064,000
Construction Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	155,148,000	134,416,000
Construction Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	155,148,000	134,416,000
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,246,447,000	1,146,673,000
Commercial Real Estate | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,243,306,000	1,145,354,000
Commercial Real Estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,141,000	1,319,000
Commercial Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,868,000	416,000
Commercial Real Estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,075,000	615,000
Commercial Real Estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	198,000	288,000
Consumer loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	103,756,000	92,996,000
Consumer loans | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	102,676,000	92,554,000
Consumer loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,080,000	442,000
Consumer loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	693,000	340,000
Consumer loans | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	130,000	45,000
Consumer loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	257,000	57,000
Commercial loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	460,220,000	441,598,000
Commercial loans | Current Loans, not past due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	459,047,000	441,239,000
Commercial loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,173,000	359,000
Commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	189,000	274,000
Commercial loans | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	731,000	72,000
Commercial loans | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 253,000	$ 13,000