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Loans and Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans Based on Portfolio Segment and Impairment Method (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Allowance for loan losses: |  |  |  |  |
Balance, beginning of year | $ 6,277 | $ 6,181 | $ 6,328 | $ 5,945 | $ 5,945
Provision charged to expense | (30) | 138 | (84) | 375 | 407
Losses charged off | (26) | (3) | (41) | (5) | (50)
Recoveries | 1 | 3 | 19 | 4 | 26
Balance, end of period | 6,222 | 6,319 | 6,222 | 6,319 | 6,328
Ending balance: individually evaluated for impairment |  | 23 |  | 23 | 23
Ending balance: collectively evaluated for impairment | 6,222 | 6,296 | 6,222 | 6,296 | 6,305
Loans: |  |  |  |  |
Ending balance | 496,397 | 500,301 | 496,397 | 500,301 | 493,753
Ending balance: individually evaluated for impairment | 1,550 | 2,743 | 1,550 | 2,743 | 1,851
Ending balance: collectively evaluated for impairment | 494,847 | 497,558 | 494,847 | 497,558 | 491,902
One- to four-family [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance, beginning of year | 990 | 1,012 | 1,031 | 997 | 997
Provision charged to expense | 14 | 11 | (30) | 25 | 29
Losses charged off | (13) |  | (13) |  | (17)
Recoveries |  |  | 3 | 1 | 22
Balance, end of period | 991 | 1,023 | 991 | 1,023 | 1,031
Ending balance: individually evaluated for impairment |  |  |  |  | 13
Ending balance: collectively evaluated for impairment | 991 | 1,023 | 991 | 1,023 | 1,018
Loans: |  |  |  |  |
Ending balance | 127,679 | 130,800 | 127,679 | 130,800 | 129,290
Ending balance: individually evaluated for impairment | 1,470 | 1,458 | 1,470 | 1,458 | 1,722
Ending balance: collectively evaluated for impairment | 126,209 | 129,342 | 126,209 | 129,342 | 127,568
Multi-family [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance, beginning of year | 1,602 | 1,656 | 1,642 | 1,650 | 1,650
Provision charged to expense | (40) | 12 | (80) | 18 | (8)
Balance, end of period | 1,562 | 1,668 | 1,562 | 1,668 | 1,642
Ending balance: collectively evaluated for impairment | 1,562 | 1,668 | 1,562 | 1,668 | 1,642
Loans: |  |  |  |  |
Ending balance | 102,756 | 108,391 | 102,756 | 108,391 | 104,663
Ending balance: individually evaluated for impairment |  | 1,200 |  | 1,200 |
Ending balance: collectively evaluated for impairment | 102,756 | 107,191 | 102,756 | 107,191 | 104,663
Home equity lines of credit [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance, beginning of year | 90 | 91 | 89 | 91 | 91
Provision charged to expense |  | 12 | 1 | 12 | 13
Losses charged off |  |  |  |  | (15)
Balance, end of period | 90 | 103 | 90 | 103 | 89
Ending balance: individually evaluated for impairment |  | 15 |  | 15 |
Ending balance: collectively evaluated for impairment | 90 | 88 | 90 | 88 | 89
Loans: |  |  |  |  |
Ending balance | 8,867 | 8,913 | 8,867 | 8,913 | 8,938
Ending balance: individually evaluated for impairment | 18 | 38 | 18 | 38 | 22
Ending balance: collectively evaluated for impairment | 8,849 | 8,875 | 8,849 | 8,875 | 8,916
Construction [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance, beginning of year | 204 | 169 | 213 | 168 | 168
Provision charged to expense | 13 | 1 | 4 | 2 | 45
Balance, end of period | 217 | 170 | 217 | 170 | 213
Ending balance: collectively evaluated for impairment | 217 | 170 | 217 | 170 | 213
Loans: |  |  |  |  |
Ending balance | 18,749 | 12,447 | 18,749 | 12,447 | 16,113
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impairment | 18,749 | 12,447 | 18,749 | 12,447 | 16,113
Commercial [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance, beginning of year | 1,657 | 1,644 | 1,623 | 1,604 | 1,604
Provision charged to expense | 28 | 160 | 62 | 200 | 19
Balance, end of period | 1,685 | 1,804 | 1,685 | 1,804 | 1,623
Ending balance: individually evaluated for impairment |  | 2 |  | 2 |
Ending balance: collectively evaluated for impairment | 1,685 | 1,802 | 1,685 | 1,802 | 1,623
Loans: |  |  |  |  |
Ending balance | 148,299 | 158,226 | 148,299 | 158,226 | 143,367
Ending balance: individually evaluated for impairment | 6 | 38 | 6 | 38 | 18
Ending balance: collectively evaluated for impairment | 148,293 | 158,188 | 148,293 | 158,188 | 143,349
Commercial [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance, beginning of year | 1,664 | 1,547 | 1,659 | 1,373 | 1,373
Provision charged to expense | (54) | (66) | (63) | 108 | 286
Recoveries |  |  | 14 |  |
Balance, end of period | 1,610 | 1,481 | 1,610 | 1,481 | 1,659
Ending balance: individually evaluated for impairment |  | 6 |  | 6 |
Ending balance: collectively evaluated for impairment | 1,610 | 1,475 | 1,610 | 1,475 | 1,659
Loans: |  |  |  |  |
Ending balance | 82,692 | 74,231 | 82,692 | 74,231 | 84,246
Ending balance: individually evaluated for impairment | 48 | 6 | 48 | 6 | 60
Ending balance: collectively evaluated for impairment | 82,644 | 74,225 | 82,644 | 74,225 | 84,186
Consumer [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance, beginning of year | 70 | 62 | 71 | 62 | 62
Provision charged to expense | 9 | 8 | 22 | 10 | 23
Losses charged off | (13) | (3) | (28) | (5) | (18)
Recoveries | 1 | 3 | 2 | 3 | 4
Balance, end of period | 67 | 70 | 67 | 70 | 71
Ending balance: individually evaluated for impairment |  |  |  |  | 10
Ending balance: collectively evaluated for impairment | 67 | 70 | 67 | 70 | 61
Loans: |  |  |  |  |
Ending balance | 7,355 | 7,293 | 7,355 | 7,293 | 7,136
Ending balance: individually evaluated for impairment | 8 | 3 | 8 | 3 | 29
Ending balance: collectively evaluated for impairment | $ 7,347 | $ 7,290 | $ 7,347 | $ 7,290 | $ 7,107

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