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Loans and Allowance for Credit Losses - Loan portfolio aging analysis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Jun. 30, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | $ 2,237,091 | $ 2,171,463
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,238 | 1,686
60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,369 | 1,977
Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,211 | 2,730
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 3,818 | 6,393
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,233,273 | 2,165,070
Residential Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 721,216 | 627,357
Residential Real Estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 312 | 772
Residential Real Estate | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 364 | 378
Residential Real Estate | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 613 | 654
Residential Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,289 | 1,804
Residential Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 719,927 | 625,553
Construction Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 134,284 | 107,472
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 | 134,254 | 107,472
Commercial Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 889,793 | 887,419
Commercial Real Estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 363 | 641
Commercial Real Estate | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable |  | 327
Commercial Real Estate | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 374 | 1,073
Commercial Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 737 | 2,041
Commercial Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 889,056 | 885,378
Consumer loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 77,674 | 80,767
Consumer loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 195 | 180
Consumer loans | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 66 | 53
Consumer loans | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 84 | 193
Consumer loans | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 345 | 426
Consumer loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 77,329 | 80,341
Commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 414,124 | 468,448
Commercial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 368 | 93
Commercial loans | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 939 | 1,219
Commercial loans | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 110 | 810
Commercial loans | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,417 | 2,122
Commercial loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | $ 412,707 | $ 466,326

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