Loans and Allowance for Credit Losses - Association's Loan Portfolio Aging Analysis (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	$ 3,154	$ 981
Current	618,617	593,343
Total loans	621,771	594,324	$ 550,905
Total Loans 90 Days Past Due & Accruing	25
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	659	153
Current	192,923	193,554
Total loans	193,582	193,707	181,934
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	671	114
Current	78,523	79,579
Total loans	79,194	79,693	77,103
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	28	55
Current	8,315	8,327
Total loans	8,343	8,382	9,581
One- to four-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,653	639
Current	168,501	163,215
Total loans	170,154	163,854	142,417
Total Loans 90 Days Past Due & Accruing	25
Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	124
Current	89,053	89,649
Total loans	89,177	89,649	98,778
Home equity lines of credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	19	20
Current	8,492	8,046
Total loans	8,511	8,066	6,778
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	72,810	50,973
Total loans	72,810	50,973	$ 34,314
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	2,294	779
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	404	153
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	531	56
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	25	47
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	1,210	523
Financing Receivables, 30 to 59 Days Past Due [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	124
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	780	142
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	255
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	85
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	3	6
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	418	116
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	19	20
Financing Receivables, 90 Days or Greater [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	80	60
Financing Receivables, 90 Days or Greater [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	55	58
Financing Receivables, 90 Days or Greater [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due		$ 2
Financing Receivables, 90 Days or Greater [Member] | One- to four-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	$ 25