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Loans and Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investment in Loans Based on Portfolio Segment and Impairment Method (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2022
Allowance for loan losses:          
Balance, beginning of year $ 7,166 $ 6,395 $ 7,052 $ 6,599 $ 6,599
Impact of adopting ASU 2016-13     47    
Provision for credit losses 367   442    
Provision charged to expense   242   39 492
Losses charged off (9) (32) (34) (50) (67)
Recoveries 11 6 28 23 28
Balance, end of period 7,535 6,611 7,535 6,611 7,052
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   6,611   6,611 7,052
Loans:          
Ending balance 585,814 505,712 585,814 505,712 525,736
Ending balance: individually evaluated for impairment   1,114   1,114 1,385
Ending balance: collectively evaluated for impairment   504,598   504,598 524,351
One- to four-family [Member]          
Allowance for loan losses:          
Balance, beginning of year 1,722 1,082 1,028 967 967
Impact of adopting ASU 2016-13     382    
Provision for credit losses 268   579    
Provision charged to expense   (13)   101 100
Losses charged off 0 (26) 0 (26) (40)
Recoveries 0 0 1 1 1
Balance, end of period 1,990 1,043 1,990 1,043 1,028
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   1,043   1,043 1,028
Loans:          
Ending balance 158,388 124,590 158,388 124,590 132,474
Ending balance: individually evaluated for impairment   1,076   1,076 1,350
Ending balance: collectively evaluated for impairment   123,514   123,514 131,124
Multi-family [Member]          
Allowance for loan losses:          
Balance, beginning of year 1,402 1,400 1,375 1,674 1,674
Impact of adopting ASU 2016-13     (140)    
Provision for credit losses (117)   50    
Provision charged to expense   27   (247) (299)
Losses charged off 0 0 0 0 0
Recoveries 0 0 0 0 0
Balance, end of period 1,285 1,427 1,285 1,427 1,375
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   1,427   1,427 1,375
Loans:          
Ending balance 98,891 88,566 98,891 88,566 88,247
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   88,566   88,566 88,247
Home equity lines of credit [Member]          
Allowance for loan losses:          
Balance, beginning of year 101 62 70 67 67
Impact of adopting ASU 2016-13     33    
Provision for credit losses (3)   (5)    
Provision charged to expense   4   (1) 3
Losses charged off 0 0 0 0 0
Recoveries 0 0 0 0 0
Balance, end of period 98 66 98 66 70
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   66   66 70
Loans:          
Ending balance 7,058 6,600 7,058 6,600 6,987
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   6,600   6,600 6,987
Construction [Member]          
Allowance for loan losses:          
Balance, beginning of year 585 299 489 258 258
Impact of adopting ASU 2016-13     192    
Provision for credit losses 101   5    
Provision charged to expense   60   101 231
Losses charged off 0 0 0 0 0
Recoveries 0 0 0 0 0
Balance, end of period 686 359 686 359 489
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   359   359 489
Loans:          
Ending balance 42,881 31,127 42,881 31,127 41,254
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   31,127   31,127 41,254
Commercial [Member]          
Allowance for loan losses:          
Balance, beginning of year 2,392 1,962 1,985 1,831 1,831
Impact of adopting ASU 2016-13     385    
Provision for credit losses 118   140    
Provision charged to expense   4   135 154
Losses charged off 0 0 0 0 0
Recoveries 0 0 0 0 0
Balance, end of period 2,510 1,966 2,510 1,966 1,985
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   1,966   1,966 1,985
Loans:          
Ending balance 198,976 165,132 198,976 165,132 167,375
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   165,132   165,132 167,375
Commercial [Member]          
Allowance for loan losses:          
Balance, beginning of year 871 1,521 2,025 1,740 1,740
Impact of adopting ASU 2016-13     (818)    
Provision for credit losses 12   (332)    
Provision charged to expense   154   (77) 265
Losses charged off 0 0 (4) 0 0
Recoveries 6 4 18 16 20
Balance, end of period 889 1,679 889 1,679 2,025
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   1,679   1,679 2,025
Loans:          
Ending balance 71,129 81,399 71,129 81,399 80,418
Ending balance: individually evaluated for impairment   38   38 35
Ending balance: collectively evaluated for impairment   81,361   81,361 80,383
Consumer [Member]          
Allowance for loan losses:          
Balance, beginning of year 93 69 80 62 62
Impact of adopting ASU 2016-13     13    
Provision for credit losses (12)   5    
Provision charged to expense   6   27 38
Losses charged off (9) (6) (30) (24) (27)
Recoveries 5 2 9 6 7
Balance, end of period 77 71 77 71 80
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   71   71 80
Loans:          
Ending balance $ 8,491 8,298 $ 8,491 8,298 8,981
Ending balance: individually evaluated for impairment   0   0 0
Ending balance: collectively evaluated for impairment   $ 8,298   $ 8,298 $ 8,981