v3.25.2
Loans - Schedule of Allowance for Loan Losses and Allocation of The Allowance to Loan Segments (Detail) - USD ($)
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Allowance for loan losses      
Beginning Balance [1] $ 1,553,000    
Loans charged-off 0 $ 0  
Ending Balance [1] 1,547,000 1,553,000  
Allowance for credit losses for loans [Member]      
Allowance for loan losses      
Beginning Balance 1,553,000 1,747,000  
Adoption of ASU 2016-13 [2]     $ 12,000
Loans And Leases Receivable Allowance Adjusted Balance     1,759,000
Provision (benefit) for credit losses (6,000) (203,000)  
Loans charged-off   (3,000)  
Ending Balance 1,547,000 1,553,000  
Allowance for credit losses for off-balance sheet exposures [Member]      
Allowance for loan losses      
Beginning Balance 31,000 0  
Adoption of ASU 2016-13     23,000
Loans And Leases Receivable Allowance Adjusted Balance     23,000
Provision (benefit) for credit losses (3,000) 8,000  
Ending Balance 28,000 31,000  
Residential Portfolio Segment [Member]      
Allowance for loan losses      
Beginning Balance 1,043,000    
Ending Balance 1,028,000 1,043,000  
1-4 family [Member] | Allowance for credit losses for loans [Member]      
Allowance for loan losses      
Beginning Balance 1,043,000 974,000  
Adoption of ASU 2016-13 [2]     139,000
Loans And Leases Receivable Allowance Adjusted Balance     1,113,000
Provision (benefit) for credit losses (15,000) (70,000)  
Loans charged-off   0  
Ending Balance 1,028,000 1,043,000  
1-4 family [Member] | Allowance for credit losses for off-balance sheet exposures [Member]      
Allowance for loan losses      
Beginning Balance 5,000 0  
Adoption of ASU 2016-13     5,000
Loans And Leases Receivable Allowance Adjusted Balance     5,000
Provision (benefit) for credit losses (1,000) 0  
Ending Balance 4,000 5,000  
Multifamily [Member]      
Allowance for loan losses      
Beginning Balance 191,000    
Ending Balance 208,000 191,000  
Multifamily [Member] | Allowance for credit losses for loans [Member]      
Allowance for loan losses      
Beginning Balance 191,000 190,000  
Adoption of ASU 2016-13 [2]     2,000
Loans And Leases Receivable Allowance Adjusted Balance     192,000
Provision (benefit) for credit losses 17,000 (1,000)  
Loans charged-off   0  
Ending Balance 208,000 191,000  
Multifamily [Member] | Allowance for credit losses for off-balance sheet exposures [Member]      
Allowance for loan losses      
Beginning Balance 26,000 0  
Adoption of ASU 2016-13     7,000
Loans And Leases Receivable Allowance Adjusted Balance     7,000
Provision (benefit) for credit losses (2,000) 19,000  
Ending Balance 24,000 26,000  
Second mortgages and home equity lines of credit [Member]      
Allowance for loan losses      
Beginning Balance 18,000    
Ending Balance 52,000 18,000  
Second mortgages and home equity lines of credit [Member] | Allowance for credit losses for loans [Member]      
Allowance for loan losses      
Beginning Balance 18,000 29,000  
Adoption of ASU 2016-13 [2]     23,000
Loans And Leases Receivable Allowance Adjusted Balance     52,000
Provision (benefit) for credit losses 34,000 (34,000)  
Loans charged-off   0  
Ending Balance 52,000 18,000  
Second mortgages and home equity lines of credit [Member] | Allowance for credit losses for off-balance sheet exposures [Member]      
Allowance for loan losses      
Beginning Balance 0 0  
Adoption of ASU 2016-13     0
Loans And Leases Receivable Allowance Adjusted Balance     0
Provision (benefit) for credit losses 0 0  
Ending Balance 0 0  
Construction [Member] | Allowance for credit losses for loans [Member]      
Allowance for loan losses      
Beginning Balance 0 0  
Adoption of ASU 2016-13 [2]     0
Loans And Leases Receivable Allowance Adjusted Balance     0
Provision (benefit) for credit losses 0 0  
Loans charged-off   0  
Ending Balance 0 0  
Construction [Member] | Allowance for credit losses for off-balance sheet exposures [Member]      
Allowance for loan losses      
Beginning Balance 0 0  
Adoption of ASU 2016-13     0
Loans And Leases Receivable Allowance Adjusted Balance     0
Provision (benefit) for credit losses 0 0  
Ending Balance 0 0  
Commercial Real Estate Portfolio Segment [Member]      
Allowance for loan losses      
Beginning Balance 240,000    
Ending Balance 201,000 240,000  
Commercial Real Estate Portfolio Segment [Member] | Allowance for credit losses for loans [Member]      
Allowance for loan losses      
Beginning Balance 240,000 346,000  
Adoption of ASU 2016-13 [2]     (19,000)
Loans And Leases Receivable Allowance Adjusted Balance     327,000
Provision (benefit) for credit losses (39,000) (87,000)  
Loans charged-off   0  
Ending Balance 201,000 240,000  
Commercial Real Estate Portfolio Segment [Member] | Allowance for credit losses for off-balance sheet exposures [Member]      
Allowance for loan losses      
Beginning Balance 0 0  
Adoption of ASU 2016-13     7,000
Loans And Leases Receivable Allowance Adjusted Balance     7,000
Provision (benefit) for credit losses 0 (7,000)  
Ending Balance 0 0  
Consumer Portfolio Segment [Member]      
Allowance for loan losses      
Beginning Balance 1,000    
Ending Balance 1,000 1,000  
Consumer Portfolio Segment [Member] | Allowance for credit losses for loans [Member]      
Allowance for loan losses      
Beginning Balance 1,000 0  
Adoption of ASU 2016-13 [2]     2,000
Loans And Leases Receivable Allowance Adjusted Balance     2,000
Provision (benefit) for credit losses 0 2,000  
Loans charged-off   (3,000)  
Ending Balance 1,000 1,000  
Consumer Portfolio Segment [Member] | Allowance for credit losses for off-balance sheet exposures [Member]      
Allowance for loan losses      
Beginning Balance 0 0  
Adoption of ASU 2016-13     4,000
Loans And Leases Receivable Allowance Adjusted Balance     4,000
Provision (benefit) for credit losses 0 (4,000)  
Ending Balance 0 0  
Home improvement [Member]      
Allowance for loan losses      
Beginning Balance 60,000    
Ending Balance 57,000 60,000  
Home improvement [Member] | Allowance for credit losses for loans [Member]      
Allowance for loan losses      
Beginning Balance 60,000 64,000  
Adoption of ASU 2016-13 [2]     9,000
Loans And Leases Receivable Allowance Adjusted Balance     73,000
Provision (benefit) for credit losses (3,000) (13,000)  
Loans charged-off   0  
Ending Balance 57,000 60,000  
Home improvement [Member] | Allowance for credit losses for off-balance sheet exposures [Member]      
Allowance for loan losses      
Beginning Balance 0 0  
Adoption of ASU 2016-13     0
Loans And Leases Receivable Allowance Adjusted Balance     0
Provision (benefit) for credit losses 0 0  
Ending Balance 0 0  
Unallocated Financing Receivables [Member] | Allowance for credit losses for loans [Member]      
Allowance for loan losses      
Beginning Balance 0 144,000  
Adoption of ASU 2016-13 [2]     (144,000)
Loans And Leases Receivable Allowance Adjusted Balance     0
Provision (benefit) for credit losses 0 0  
Loans charged-off   0  
Ending Balance 0 0  
Unallocated Financing Receivables [Member] | Allowance for credit losses for off-balance sheet exposures [Member]      
Allowance for loan losses      
Beginning Balance 0 0  
Adoption of ASU 2016-13     0
Loans And Leases Receivable Allowance Adjusted Balance     $ 0
Provision (benefit) for credit losses 0 0  
Ending Balance $ 0 $ 0  
[1] The Company adopted ASU 2016-13 on July 1, 2023 with a modified retrospective approach. Accordingly, at June 30, 2025 and 2024, the allowance for credit losses was determined in accordance with ASC 326, “Financial Instruments - Credit Losses.”
[2] Represents the net adjustment needed to reflect the cumulative day one impact pursuant to the Company's adoption of ASU 2016-13 (i.e., the cumulative effect adjustment related to the adoption of ASU 2016-13 as of July 1, 2023).