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Loans and Allowance for Loan Losses - Association's Loan Portfolio Aging Analysis (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | $ 2,802 | $ 3,290 |
Current | 497,880 | 490,463 |
Total loans | 500,682 | 493,753 | $ 498,578
Total Loans 90 Days Past Due & Accruing | 429 | 226 |
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 250 | 92 |
Current | 143,146 | 143,275 |
Total loans | 143,396 | 143,367 | 152,019
Total Loans 90 Days Past Due & Accruing | 72 |  |
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 541 | 351 |
Current | 83,271 | 83,895 |
Total loans | 83,812 | 84,246 | 80,350
Total Loans 90 Days Past Due & Accruing | 228 |  |
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 79 | 128 |
Current | 7,075 | 7,008 |
Total loans | 7,154 | 7,136 | 6,964
Total Loans 90 Days Past Due & Accruing | 0 |  |
One- to four-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 1,921 | 2,251 |
Current | 127,264 | 127,039 |
Total loans | 129,185 | 129,290 | 129,266
Total Loans 90 Days Past Due & Accruing | 129 | 226 |
Multi-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 0 | 422 |
Current | 107,107 | 104,241 |
Total loans | 107,107 | 104,663 | 106,400
Total Loans 90 Days Past Due & Accruing | 0 |  |
Home equity lines of credit [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 11 | 46 |
Current | 9,120 | 8,892 |
Total loans | 9,131 | 8,938 | 9,058
Total Loans 90 Days Past Due & Accruing | 0 |  |
Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 0 |  |
Current | 20,897 | 16,113 |
Total loans | 20,897 | 16,113 | $ 14,521
Total Loans 90 Days Past Due & Accruing | 0 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 1,756 | 2,401 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 177 | 74 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 76 | 291 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 47 | 99 |
Financing Receivables, 30 to 59 Days Past Due [Member] | One- to four-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 1,445 | 1,515 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Multi-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 0 | 422 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Home equity lines of credit [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 11 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 0 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 437 | 287 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 0 | 6 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 232 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 32 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | One- to four-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 173 | 255 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Multi-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 0 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Home equity lines of credit [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 0 | 26 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 0 |  |
Financing Receivables, 90 Days or Greater [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 609 | 602 |
Financing Receivables, 90 Days or Greater [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 73 | 12 |
Financing Receivables, 90 Days or Greater [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 233 | 60 |
Financing Receivables, 90 Days or Greater [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 0 | 29 |
Financing Receivables, 90 Days or Greater [Member] | One- to four-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 303 | 481 |
Financing Receivables, 90 Days or Greater [Member] | Multi-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 0 |  |
Financing Receivables, 90 Days or Greater [Member] | Home equity lines of credit [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 0 | $ 20 |
Financing Receivables, 90 Days or Greater [Member] | Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | $ 0 |  |

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