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Loans and Allowance for Loan Losses - Summary of Impaired Loans (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
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Specific Allowance |  | $ 23 |  | $ 23 | $ 23
Recorded Balance | $ 1,550 | 2,743 | $ 1,550 | 2,743 | 1,851
Unpaid Principal Balance | 1,550 | 2,743 | 1,550 | 2,743 | 1,851
Specific Allowance |  | 23 |  | 23 | 23
Average Investment in Impaired Loans | 1,577 | 2,763 | 1,592 | 2,779 | 1,922
Interest Income Recognized | 15 | 38 | 29 | 75 | 74
Interest on Cash Basis | 15 | 37 | 30 | 77 | 83
Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 6 | 36 | 6 | 36 | 18
Unpaid Principal Balance, Loans without a specific allowance | 6 | 36 | 6 | 36 | 18
Average Investment in Impaired Loans, Loans without a specific allowance | 11 | 40 | 12 | 41 | 34
Recorded Balance, Loans with a specific allowance |  | 2 |  | 2 |
Unpaid Principal Balance, Loans with a specific allowance |  | 2 |  | 2 |
Specific Allowance |  | 2 |  | 2 |
Average Investment in Impaired Loans, Loans with a specific allowance |  | 2 |  | 3 |
Recorded Balance | 6 | 38 | 6 | 38 | 18
Unpaid Principal Balance | 6 | 38 | 6 | 38 | 18
Specific Allowance |  | 2 |  | 2 |
Average Investment in Impaired Loans | 11 | 42 | 12 | 44 | 34
Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 48 |  | 48 |  | 60
Unpaid Principal Balance, Loans without a specific allowance | 48 |  | 48 |  | 60
Average Investment in Impaired Loans, Loans without a specific allowance | 52 |  | 54 |  | 63
Interest Income Recognized, Loans without a specific allowance |  |  |  |  | 6
Interest on Cash Basis, Loans without a specific allowance |  |  |  |  | 6
Recorded Balance, Loans with a specific allowance |  | 6 |  | 6 |
Unpaid Principal Balance, Loans with a specific allowance |  | 6 |  | 6 |
Specific Allowance |  | 6 |  | 6 |
Average Investment in Impaired Loans, Loans with a specific allowance |  | 8 |  | 8 |
Recorded Balance | 48 | 6 | 48 | 6 | 60
Unpaid Principal Balance | 48 | 6 | 48 | 6 | 60
Specific Allowance |  | 6 |  | 6 |
Average Investment in Impaired Loans | 52 | 8 | 54 | 8 | 63
Interest Income Recognized |  |  |  |  | 6
Interest on Cash Basis |  |  |  |  | 6
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 8 | 3 | 8 | 3 | 19
Unpaid Principal Balance, Loans without a specific allowance | 8 | 3 | 8 | 3 | 19
Average Investment in Impaired Loans, Loans without a specific allowance | 10 | 3 | 10 | 3 | 24
Interest Income Recognized, Loans without a specific allowance |  |  |  |  | 2
Interest on Cash Basis, Loans without a specific allowance |  |  |  |  | 2
Recorded Balance, Loans with a specific allowance |  |  |  |  | 10
Unpaid Principal Balance, Loans with a specific allowance |  |  |  |  | 10
Specific Allowance |  |  |  |  | 10
Average Investment in Impaired Loans, Loans with a specific allowance |  |  |  |  | 11
Interest Income Recognized, Loans with a specific allowance |  |  |  |  | 1
Interest on Cash Basis, Loans with a specific allowance |  |  |  |  | 1
Recorded Balance | 8 | 3 | 8 | 3 | 29
Unpaid Principal Balance | 8 | 3 | 8 | 3 | 29
Specific Allowance |  |  |  |  | 10
Average Investment in Impaired Loans | 10 | 3 | 10 | 3 | 35
Interest Income Recognized |  |  |  |  | 3
Interest on Cash Basis |  |  |  |  | 3
One- to four-family [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 1,470 | 1,458 | 1,470 | 1,458 | 1,676
Unpaid Principal Balance, Loans without a specific allowance | 1,470 | 1,458 | 1,470 | 1,458 | 1,676
Average Investment in Impaired Loans, Loans without a specific allowance | 1,486 | 1,467 | 1,496 | 1,477 | 1,718
Interest Income Recognized, Loans without a specific allowance | 15 | 16 | 29 | 32 | 63
Interest on Cash Basis, Loans without a specific allowance | 15 | 16 | 30 | 34 | 71
Recorded Balance, Loans with a specific allowance |  |  |  |  | 46
Unpaid Principal Balance, Loans with a specific allowance |  |  |  |  | 46
Specific Allowance |  |  |  |  | 13
Average Investment in Impaired Loans, Loans with a specific allowance |  |  |  |  | 47
Interest Income Recognized, Loans with a specific allowance |  |  |  |  | 1
Interest on Cash Basis, Loans with a specific allowance |  |  |  |  | 1
Recorded Balance | 1,470 | 1,458 | 1,470 | 1,458 | 1,722
Unpaid Principal Balance | 1,470 | 1,458 | 1,470 | 1,458 | 1,722
Specific Allowance |  |  |  |  | 13
Average Investment in Impaired Loans | 1,486 | 1,467 | 1,496 | 1,477 | 1,765
Interest Income Recognized | 15 | 16 | 29 | 32 | 64
Interest on Cash Basis | 15 | 16 | 30 | 34 | 72
Multi-family [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance |  | 1,200 |  | 1,200 |
Unpaid Principal Balance, Loans without a specific allowance |  | 1,200 |  | 1,200 |
Average Investment in Impaired Loans, Loans without a specific allowance |  | 1,204 |  | 1,207 | 1
Interest Income Recognized, Loans without a specific allowance |  | 21 |  | 42 |
Interest on Cash Basis, Loans without a specific allowance |  | 21 |  | 42 |
Recorded Balance |  | 1,200 |  | 1,200 |
Unpaid Principal Balance |  | 1,200 |  | 1,200 |
Average Investment in Impaired Loans |  | 1,204 |  | 1,207 | 1
Interest Income Recognized |  | 21 |  | 42 |
Interest on Cash Basis |  | 21 |  | 42 |
Home equity lines of credit [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 18 | 23 | 18 | 23 | 22
Unpaid Principal Balance, Loans without a specific allowance | 18 | 23 | 18 | 23 | 22
Average Investment in Impaired Loans, Loans without a specific allowance | 18 | 24 | 20 | 25 | 24
Interest Income Recognized, Loans without a specific allowance |  | 1 |  | 1 | 1
Interest on Cash Basis, Loans without a specific allowance |  |  |  | 1 | 2
Recorded Balance, Loans with a specific allowance |  | 15 |  | 15 |
Unpaid Principal Balance, Loans with a specific allowance |  | 15 |  | 15 |
Specific Allowance |  | 15 |  | 15 |
Average Investment in Impaired Loans, Loans with a specific allowance |  | 15 |  | 15 |
Recorded Balance | 18 | 38 | 18 | 38 | 22
Unpaid Principal Balance | 18 | 38 | 18 | 38 | 22
Specific Allowance |  | 15 |  | 15 |
Average Investment in Impaired Loans | $ 18 | 39 | $ 20 | 40 | 24
Interest Income Recognized |  | $ 1 |  | 1 | 1
Interest on Cash Basis |  |  |  | $ 1 | $ 2

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