Loans and Allowance for Credit Losses - Association's Loan Portfolio Aging Analysis (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	$ 3,332	$ 3,154
Current	622,106	636,732
Total loans	625,438	639,886	$ 654,189
Total Loans > 90 Days & Accruing		29
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,624	1,298
Current	194,398	200,252
Total loans	196,022	201,550	205,103
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	142	556
Current	93,101	93,405
Total loans	93,243	93,961	98,894
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	70	73
Current	5,794	5,782
Total loans	5,864	5,855	7,186
One- to four-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,369	1,202
Current	180,248	177,777
Total loans	181,617	178,979	176,334
Total Loans > 90 Days & Accruing		29
Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	113	25
Current	118,205	126,102
Total loans	118,318	126,127	125,906
Home equity lines of credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	14
Current	10,345	10,487
Total loans	10,359	10,487	9,927
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	20,015	22,927
Total loans	20,015	22,927	$ 30,839
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,374	2,252
Financing Receivables, 30 to 59 Days Past Due [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	583	1,049
Financing Receivables, 30 to 59 Days Past Due [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	20	256
Financing Receivables, 30 to 59 Days Past Due [Member] \| Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	8	56
Financing Receivables, 30 to 59 Days Past Due [Member] \| One- to four-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	636	866
Financing Receivables, 30 to 59 Days Past Due [Member] \| Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	113	25
Financing Receivables, 30 to 59 Days Past Due [Member] \| Home equity lines of credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	14
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	956	856
Financing Receivables, 60 to 89 Days Past Due [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	415	249
Financing Receivables, 60 to 89 Days Past Due [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due		300
Financing Receivables, 60 to 89 Days Past Due [Member] \| Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	62
Financing Receivables, 60 to 89 Days Past Due [Member] \| One- to four-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	479	307
Financing Receivables, Greater Than 90 Days [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,002	46
Financing Receivables, Greater Than 90 Days [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	626
Financing Receivables, Greater Than 90 Days [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	122
Financing Receivables, Greater Than 90 Days [Member] \| Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	0	17
Financing Receivables, Greater Than 90 Days [Member] \| One- to four-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	$ 254	$ 29