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Loans and Allowance for Credit Losses - Association's Loan Portfolio Aging Analysis (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2021
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | $ 2,852 | $ 1,791 |
Current | 548,053 | 523,945 |
Total loans | 550,905 | 525,736 | $ 512,984
Total Loans 90 Days Past Due & Accruing | 62 | 47 |
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 20 |  |
Current | 181,914 | 167,375 |
Total loans | 181,934 | 167,375 | 163,859
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 139 |  |
Current | 76,964 | 80,418 |
Total loans | 77,103 | 80,418 | 88,962
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 26 | 99 |
Current | 9,555 | 8,882 |
Total loans | 9,581 | 8,981 | 7,615
One- to four-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 2,646 | 1,692 |
Current | 139,771 | 130,782 |
Total loans | 142,417 | 132,474 | 117,854
Total Loans 90 Days Past Due & Accruing | 62 | 47 |
Multi-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Current | 98,778 | 88,247 |
Total loans | 98,778 | 88,247 | 97,211
Home equity lines of credit [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 21 |  |
Current | 6,757 | 6,987 |
Total loans | 6,778 | 6,987 | 6,274
Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Current | 34,314 | 41,254 |
Total loans | 34,314 | 41,254 | $ 31,209
Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 1,539 | 452 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 20 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 139 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 9 | 78 |
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 | 1,371 | 374 |
Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 125 | 165 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 17 | 21 |
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 | 87 | 144 |
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 | 21 |  |
Financing Receivables, 90 Days or Greater [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 1,188 | 1,174 |
Financing Receivables, 90 Days or Greater [Member] | One- to four-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | $ 1,188 | $ 1,174 |

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