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Loans and Allowance for Loan Losses - Association's Loan Portfolio Aging Analysis (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | $ 4,108 | $ 3,290 |
Current | 492,289 | 490,463 |
Total loans | 496,397 | 493,753 | $ 500,301
Total Loans 90 Days Past Due & Accruing | 326 | 226 |
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 1,000 | 92 |
Current | 147,299 | 143,275 |
Total loans | 148,299 | 143,367 | 158,226
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 569 | 351 |
Current | 82,123 | 83,895 |
Total loans | 82,692 | 84,246 | 74,231
Total Loans 90 Days Past Due & Accruing | 30 |  |
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 127 | 128 |
Current | 7,228 | 7,008 |
Total loans | 7,355 | 7,136 | 7,293
One- to four-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 1,914 | 2,251 |
Current | 125,765 | 127,039 |
Total loans | 127,679 | 129,290 | 130,800
Total Loans 90 Days Past Due & Accruing | 296 | 226 |
Multi-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due |  | 422 |
Current | 102,756 | 104,241 |
Total loans | 102,756 | 104,663 | 108,391
Home equity lines of credit [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 498 | 46 |
Current | 8,369 | 8,892 |
Total loans | 8,867 | 8,938 | 8,913
Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Current | 18,749 | 16,113 |
Total loans | 18,749 | 16,113 | $ 12,447
Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 2,949 | 2,401 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 890 | 74 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 217 | 291 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 83 | 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 | 1,261 | 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 |  | 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 | 498 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 747 | 287 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 110 | 6 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 274 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 44 |  |
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 | 319 | 255 |
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 |  | 26 |
Financing Receivables, 90 Days or Greater [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 412 | 602 |
Financing Receivables, 90 Days or Greater [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due |  | 12 |
Financing Receivables, 90 Days or Greater [Member] | Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | 78 | 60 |
Financing Receivables, 90 Days or Greater [Member] | Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due |  | 29 |
Financing Receivables, 90 Days or Greater [Member] | One- to four-family [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due | $ 334 | 481 |
Financing Receivables, 90 Days or Greater [Member] | Home equity lines of credit [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total Past Due |  | $ 20 |

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