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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