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Loans and Allowance for Credit Losses - Loan portfolio aging analysis (Details) | 12 Months Ended
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Jun. 30, 2024 USD ($) loan | Jun. 30, 2023 USD ($) loan
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | $ 3,850,035,000 | $ 3,619,197,000
Greater than 90 Days Past Due and Accruing |  | 109,000
Financial Asset, Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 9,201,000 | 10,741,000
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 3,128,000 | 4,212,000
60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,621,000 | 2,767,000
Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | $ 3,452,000 | $ 3,762,000
Number of PCD loans greater than 90 days past due | loan | 1 | 0
Purchased credit-impaired loans | $ 560,000 | $ 0
Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 3,840,834,000 | 3,608,456,000
Residential Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,185,692,000 | 1,133,417,000
Greater than 90 Days Past Due and Accruing |  | 109,000
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,846,000 | 2,868,000
Residential Portfolio Segment [Member] | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 520,000 | 1,984,000
Residential Portfolio Segment [Member] | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,848,000 | 401,000
Residential Portfolio Segment [Member] | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 478,000 | 483,000
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,182,846,000 | 1,130,549,000
Construction Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 229,088,000 | 190,856,000
Construction Real Estate | Financial Asset, Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 589,000 | 1,452,000
Construction Real Estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 213,000 | 443,000
Construction Real Estate | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 376,000 | 311,000
Construction Real Estate | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable |  | 698,000
Construction Real Estate | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 228,499,000 | 189,404,000
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,622,365,000 | 1,562,379,000
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,138,000 | 4,050,000
Commercial Real Estate Portfolio Segment [Member] | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,042,000 | 616,000
Commercial Real Estate Portfolio Segment [Member] | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,000 | 1,854,000
Commercial Real Estate Portfolio Segment [Member] | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,095,000 | 1,580,000
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,620,227,000 | 1,558,329,000
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 144,598,000 | 133,515,000
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 917,000 | 792,000
Consumer Portfolio Segment [Member] | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 476,000 | 456,000
Consumer Portfolio Segment [Member] | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 311,000 | 124,000
Consumer Portfolio Segment [Member] | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 130,000 | 212,000
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 143,681,000 | 132,723,000
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 668,292,000 | 599,030,000
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,711,000 | 1,579,000
Commercial Portfolio Segment [Member] | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 877,000 | 713,000
Commercial Portfolio Segment [Member] | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 85,000 | 77,000
Commercial Portfolio Segment [Member] | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,749,000 | 789,000
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | $ 665,581,000 | $ 597,451,000

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