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Loans and Allowance for Loan Losses - Categories of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018
--- | --- | --- | --- | --- | --- | ---
Real estate loans |  |  |  |  |  |
Total loans | $ 496,397 |  | $ 493,753 | $ 500,301 |  |
Unearned fees and discounts, net | (306) |  | (349) |  |  |
Allowance for loan losses | 6,222 | $ 6,277 | 6,328 | 6,319 | $ 6,181 | $ 5,945
Loans, net | 490,481 |  | 487,774 |  |  |
One- to four-family [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 127,679 |  | 129,290 | 130,800 |  |
Allowance for loan losses | 991 | 990 | 1,031 | 1,023 | 1,012 | 997
Multi-family [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 102,756 |  | 104,663 | 108,391 |  |
Allowance for loan losses | 1,562 | 1,602 | 1,642 | 1,668 | 1,656 | 1,650
Home equity lines of credit [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 8,867 |  | 8,938 | 8,913 |  |
Allowance for loan losses | 90 | 90 | 89 | 103 | 91 | 91
Construction [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 18,749 |  | 16,113 | 12,447 |  |
Allowance for loan losses | 217 | 204 | 213 | 170 | 169 | 168
Commercial [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 148,299 |  | 143,367 | 158,226 |  |
Allowance for loan losses | 1,685 | 1,657 | 1,623 | 1,804 | 1,644 | 1,604
Commercial [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 82,692 |  | 84,246 | 74,231 |  |
Allowance for loan losses | 1,610 | 1,664 | 1,659 | 1,481 | 1,547 | 1,373
Consumer [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 7,355 |  | 7,136 | 7,293 |  |
Allowance for loan losses | $ 67 | $ 70 | $ 71 | $ 70 | $ 62 | $ 62

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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