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Loans and Allowance for Credit Losses - Loan portfolio aging analysis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | $ 2,283,300 | $ 2,237,091
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,549 | 1,238
60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 885 | 1,369
Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,372 | 1,211
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 4,806 | 3,818
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,278,494 | 2,233,273
Residential Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 762,204 | 721,216
Residential Real Estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,475 | 312
Residential Real Estate | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 84 | 364
Residential Real Estate | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 499 | 613
Residential Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,058 | 1,289
Residential Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 760,146 | 719,927
Construction Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 127,946 | 134,284
Construction Real Estate | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable |  | 30
Construction Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable |  | 30
Construction Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 127,946 | 134,254
Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 901,281 | 889,793
Commercial Real Estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 598 | 363
Commercial Real Estate | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 671 |
Commercial Real Estate | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable |  | 374
Commercial Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,269 | 737
Commercial Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 900,012 | 889,056
Consumer loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 80,467 | 77,674
Consumer loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 193 | 195
Consumer loans | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 87 | 66
Consumer loans | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 56 | 84
Consumer loans | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 336 | 345
Consumer loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 80,131 | 77,329
Commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 411,402 | 414,124
Commercial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 283 | 368
Commercial loans | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 43 | 939
Commercial loans | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 817 | 110
Commercial loans | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,143 | 1,417
Commercial loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | $ 410,259 | $ 412,707

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