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Loans and Allowance for Loan Losses - Association's Loan Portfolio Aging Analysis (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | $ 1,588 | $ 2,226 |
Current | 523,445 | 513,661 |
Total loans | 525,033 | 515,887 | $ 496,903
Total Loans 90 Days Past Due & Accruing | 142 | 304 |
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 285 | 267 |
Current | 156,811 | 144,846 |
Total loans | 157,096 | 145,113 | 146,500
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 3 | 248 |
Current | 109,179 | 107,333 |
Total loans | 109,182 | 107,581 | 84,825
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 44 | 67 |
Current | 8,054 | 7,462 |
Total loans | 8,098 | 7,529 | 7,714
One- to four-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 1,256 | 1,644 |
Current | 124,318 | 127,232 |
Total loans | 125,574 | 128,876 | 126,152
Total Loans 90 Days Past Due & Accruing | 142 | 304 |
Multi-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Current | 106,886 | 96,195 |
Total loans | 106,886 | 96,195 | 105,548
Home equity lines of credit [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Current | 8,147 | 8,551 |
Total loans | 8,147 | 8,551 | 8,897
Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Current | 10,050 | 22,042 |
Total loans | 10,050 | 22,042 | $ 17,267
Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 1,152 | 1,230 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 258 | 172 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 19 | 24 |
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 | 875 | 1,034 |
Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 259 | 367 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 27 | 95 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 3 | 4 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 25 | 43 |
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 | 204 | 225 |
Financing Receivables, 90 Days or Greater [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 177 | 629 |
Financing Receivables, 90 Days or Greater [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due |  | 244 |
Financing Receivables, 90 Days or Greater [Member] | One- to four-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | $ 177 | $ 385 |

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