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Loans and Allowance for Loan Losses - Allowance for Credit 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, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Allowance for loan losses:          
Balance, beginning of year $ 7,023 $ 6,470 $ 7,052 $ 6,599 $ 6,599
Impact of adopting ASU 2016-13     47    
Provision charged to expense 142 (76) 75 (203) 492
Losses charged off (9) (8) (25) (18) (67)
Recoveries 10 9 17 17 28
Balance, end of period 7,166 6,395 7,166 6,395 7,052
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   6,395   6,395 7,052
Loans:          
Ending balance 568,240 498,111 568,240 498,111 525,736
Ending balance: individually evaluated for impairment   1,136   1,136 1,385
Ending balance: collectively evaluated for impairment   496,975   496,975 524,351
One- to four-family [Member]          
Allowance for loan losses:          
Balance, beginning of year 1,537 974 1,028 967 967
Impact of adopting ASU 2016-13     382    
Provision charged to expense 185 108 311 114 100
Losses charged off 0 0 0 0 (40)
Recoveries 0 0 1 1 1
Balance, end of period 1,722 1,082 1,722 1,082 1,028
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   1,082   1,082 1,028
Loans:          
Ending balance 150,711 125,406 150,711 125,406 132,474
Ending balance: individually evaluated for impairment   1,083   1,083 1,350
Ending balance: collectively evaluated for impairment   124,323   124,323 131,124
Multi-family [Member]          
Allowance for loan losses:          
Balance, beginning of year 1,284 1,562 1,375 1,674 1,674
Impact of adopting ASU 2016-13     (140)    
Provision charged to expense 118 (162) 167 (274) (299)
Losses charged off 0 0 0 0 0
Recoveries 0 0 0 0 0
Balance, end of period 1,402 1,400 1,402 1,400 1,375
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   1,400   1,400 1,375
Loans:          
Ending balance 100,147 86,790 100,147 86,790 88,247
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   86,790   86,790 88,247
Home equity lines of credit [Member]          
Allowance for loan losses:          
Balance, beginning of year 94 63 70 67 67
Impact of adopting ASU 2016-13     33    
Provision charged to expense 7 (1) (2) (5) 3
Losses charged off 0 0 0 0 0
Recoveries 0 0 0 0 0
Balance, end of period 101 62 101 62 70
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   62   62 70
Loans:          
Ending balance 6,926 6,168 6,926 6,168 6,987
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   6,168   6,168 6,987
Construction [Member]          
Allowance for loan losses:          
Balance, beginning of year 549 321 489 258 258
Impact of adopting ASU 2016-13     192    
Provision charged to expense 36 (22) (96) 41 231
Losses charged off 0 0 0 0 0
Recoveries 0 0 0 0 0
Balance, end of period 585 299 585 299 489
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   299   299 489
Loans:          
Ending balance 36,595 26,474 36,595 26,474 41,254
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   26,474   26,474 41,254
Commercial [Member]          
Allowance for loan losses:          
Balance, beginning of year 2,386 1,916 1,985 1,831 1,831
Impact of adopting ASU 2016-13     385    
Provision charged to expense 6 46 22 131 154
Losses charged off 0 0 0 0 0
Recoveries 0 0 0 0 0
Balance, end of period 2,392 1,962 2,392 1,962 1,985
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   1,962   1,962 1,985
Loans:          
Ending balance 192,015 164,879 192,015 164,879 167,375
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   164,879   164,879 167,375
Commercial [Member]          
Allowance for loan losses:          
Balance, beginning of year 1,090 1,571 2,025 1,740 1,740
Impact of adopting ASU 2016-13     (818)    
Provision charged to expense (227) (57) (344) (231) 265
Losses charged off 0 0 (4) 0 0
Recoveries 8 7 12 12 20
Balance, end of period 871 1,521 871 1,521 2,025
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   1,521   1,521 2,025
Loans:          
Ending balance 72,360 80,403 72,360 80,403 80,418
Ending balance: individually evaluated for impairment   41   41 35
Ending balance: collectively evaluated for impairment   80,362   80,362 80,383
Consumer [Member]          
Allowance for loan losses:          
Balance, beginning of year 83 63 80 62 62
Impact of adopting ASU 2016-13     13    
Provision charged to expense 17 12 17 21 38
Losses charged off (9) (8) (21) (18) (27)
Recoveries 2 2 4 4 7
Balance, end of period 93 69 93 69 80
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   69   69 80
Loans:          
Ending balance $ 9,486 7,991 $ 9,486 7,991 8,981
Ending balance: individually evaluated for impairment   12   12 0
Ending balance: collectively evaluated for impairment   $ 7,979   $ 7,979 $ 8,981