Loans and Allowance for Credit Losses - Association's Loan Portfolio Aging Analysis (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	$ 2,111	$ 981
Current	659,036	593,343
Total loans	661,147	594,324	$ 568,240
Total Loans 90 Days Past Due & Accruing	1
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	545	153
Current	215,020	193,554
Total loans	215,565	193,707	192,015
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	73	114
Current	83,625	79,579
Total loans	83,698	79,693	72,360
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	26	55
Current	8,016	8,327
Total loans	8,042	8,382	9,486
One- to four-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,326	639
Current	174,491	163,215
Total loans	175,817	163,854	150,711
Total Loans 90 Days Past Due & Accruing	1
Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	122
Current	128,503	89,649
Total loans	128,625	89,649	100,147
Home equity lines of credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	19	20
Current	9,475	8,046
Total loans	9,494	8,066	6,926
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	39,906	50,973
Total loans	39,906	50,973	$ 36,595
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,799	779
Financing Receivables, 30 to 59 Days Past Due [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	393	153
Financing Receivables, 30 to 59 Days Past Due [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	19	56
Financing Receivables, 30 to 59 Days Past Due [Member] \| Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	2	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	1,263	523
Financing Receivables, 30 to 59 Days Past Due [Member] \| Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	122
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	282	142
Financing Receivables, 60 to 89 Days Past Due [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	152
Financing Receivables, 60 to 89 Days Past Due [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	25
Financing Receivables, 60 to 89 Days Past Due [Member] \| Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	24	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	62	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	30	60
Financing Receivables, 90 Days or Greater [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	29	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	$ 1