Loans and Allowance for Credit Losses - Credit Risk Profile of Association's Loan Portfolio Based on Risk Rating Category and Calendar Year of Origination (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Sep. 30, 2025	Jun. 30, 2025
Financing Receivable, Recorded Investment [Line Items]
2025	$ 67,913	$ 45,850
2024	80,168	90,613
2023	117,527	119,598
2022	137,837	141,490
2021	75,145	76,629
Prior Years	146,848	165,706
Total loans	625,438	639,886
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	67,913	45,850
2024	79,757	90,613
2023	114,171	116,226
2022	137,112	141,484
2021	74,211	75,395
Prior Years	145,697	162,820
Total loans	618,861	632,388
Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
2024	34
2023	274
2022	219
2021		186
Prior Years	57	40
Total loans	584	226
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
2024	377
2023	3,082	3,372
2022	506	6
2021	934	1,048
Prior Years	1,094	2,846
Total loans	5,993	7,272
One- to Four-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	25,196	16,760
2024	24,115	23,826
2023	31,244	32,946
2022	43,954	45,176
2021	18,956	19,935
Prior Years	38,152	40,336
Total loans	181,617	178,979
Current period charge-offs Prior Years		(79)
Current period charge-offs Total		(79)
Current period recoveries Prior Years	2	2
Current period recoveries Total	2	2
One- to Four-Family [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	25,196	16,760
2024	23,827	23,826
2023	30,970	32,946
2022	43,951	45,173
2021	18,951	19,879
Prior Years	37,950	40,102
Total loans	180,845	178,686
One- to Four-Family [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
2024	34
2023	274
2021	0	51
Prior Years	40	40
Total loans	348	91
One- to Four-Family [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
2024	254
2022	3	3
2021	5	5
Prior Years	162	194
Total loans	424	202
Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	7,326	4,517
2024	15,562	15,648
2023	10,322	10,379
2022	38,340	39,148
2021	19,684	19,827
Prior Years	27,084	36,608
Total loans	118,318	126,127
Current period charge-offs 2024		(350)
Current period charge-offs Total		(350)
Current period recoveries 2024		220
Current period recoveries Total		220
Multi-Family [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	7,326	4,517
2024	15,562	15,648
2023	10,322	10,379
2022	38,340	39,148
2021	19,684	19,827
Prior Years	26,861	36,383
Total loans	118,095	125,902
Multi-Family [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Prior Years	223	225
Total loans	223	225
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	1,778	1,004
2024	2,570	2,884
2023	1,788	1,851
2022	1,512	1,616
2021	1,208	1,230
Prior Years	1,503	1,902
Total loans	10,359	10,487
Home Equity Line of Credit [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	1,778	1,004
2024	2,570	2,884
2023	1,788	1,851
2022	1,512	1,616
2021	1,208	1,230
Prior Years	1,503	1,902
Total loans	10,359	10,487
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	6,367	2,165
2024	1,476	8,574
2023	12,050	12,062
2022	122	123
Prior Years	0	3
Total loans	20,015	22,927
Construction [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	6,367	2,165
2024	1,476	8,574
2023	12,050	12,062
2022	122	123
Prior Years	0	3
Total loans	20,015	22,927
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	10,943	9,649
2024	14,322	14,724
2023	25,985	26,490
2022	49,836	50,471
2021	29,535	29,927
Prior Years	65,401	70,289
Total loans	196,022	201,550
Commercial [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	10,943	9,649
2024	14,199	14,724
2023	25,985	26,490
2022	49,163	50,471
2021	28,706	28,946
Prior Years	64,903	69,788
Total loans	193,899	200,068
Commercial [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
2022	170
2021	0	135
Total loans	170	135
Commercial [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
2024	123
2022	503
2021	829	846
Prior Years	498	501
Total loans	1,953	1,347
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	14,119	10,266
2024	20,747	23,374
2023	34,916	34,423
2022	3,298	4,073
2021	5,532	5,406
Prior Years	14,631	16,419
Total loans	93,243	93,961
Current period charge-offs 2025		0
Current period charge-offs 2024	(70)	(50)
Current period charge-offs Total	(70)	(50)
Current period recoveries 2024		50
Current period recoveries Prior Years	2	63
Current period recoveries Total	2	113
Commercial [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	14,119	10,266
2024	20,747	23,374
2023	31,849	31,068
2022	3,249	4,070
2021	5,432	5,209
Prior Years	14,403	14,493
Total loans	89,799	88,480
Commercial [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
2022	49
Prior Years	17
Total loans	66
Commercial [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
2024		0
2023	3,067	3,355
2022		3
2021	100	197
Prior Years	211	1,926
Total loans	3,378	5,481
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	2,184	1,489
2024	1,376	1,583
2023	1,222	1,447
2022	775	883
2021	230	304
Prior Years	77	149
Total loans	5,864	5,855
Current period charge-offs 2025	(9)	(28)
Current period charge-offs 2024		(41)
Current period charge-offs 2022		(1)
Current period charge-offs Total	(9)	(70)
Current period recoveries 2025	4	7
Current period recoveries 2024		13
Current period recoveries Total	4	20
Consumer [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
2025	2,184	1,489
2024	1,376	1,583
2023	1,207	1,430
2022	775	883
2021	230	304
Prior Years	77	149
Total loans	5,849	5,838
Consumer [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
2023	15	17
Total loans	$ 15	$ 17

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