Loans and Allowance for Credit Losses - Association's Loan Portfolio Aging Analysis (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	$ 1,383	$ 1,863
Current	652,806	644,526
Total loans	654,189	646,389	$ 621,771
Total Loans > 90 Days & Accruing	38	23
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due		150
Current	205,103	199,867
Total loans	205,103	200,017	193,582
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	21	41
Current	98,873	91,743
Total loans	98,894	91,784	79,194
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	127	51
Current	7,059	7,676
Total loans	7,186	7,727	8,343
Total Loans > 90 Days & Accruing		23
One- to four-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,087	1,201
Current	175,247	176,062
Total loans	176,334	177,263	170,154
Total Loans > 90 Days & Accruing	38
Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	144	141
Current	125,762	125,890
Total loans	125,906	126,031	89,177
Home equity lines of credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	4	42
Current	9,923	9,817
Total loans	9,927	9,859	8,511
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due		237
Current	30,839	33,471
Total loans	30,839	33,708	$ 72,810
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	549	1,452
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due		21
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	105	27
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	440	1,009
Financing Receivables, 30 to 59 Days Past Due [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due		141
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	4	17
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due		237
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	775	238
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	21	20
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1	1
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	609	192
Financing Receivables, 60 to 89 Days Past Due [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	144
Financing Receivables, 60 to 89 Days Past Due [Member] | Home equity lines of credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due		25
Financing Receivables, Greater Than 90 Days [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	59	173
Financing Receivables, Greater Than 90 Days [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due		150
Financing Receivables, Greater Than 90 Days [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	21	$ 23
Financing Receivables, Greater Than 90 Days [Member] | One- to four-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	$ 38