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Loans and Allowance for Credit Losses - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Loans
Sep. 30, 2025
USD ($)
SecurityLoan
Jun. 30, 2025
USD ($)
SecurityLoan
Loans and Allowance for Credit Losses [Line Items]      
Loans held for sale     $ 0
Maximum term of fixed-rate one- to four-family residential mortgage loans   15 years  
Number of default loans | SecurityLoan   0 0
Foreclosed residential real estate properties $ 40,000 $ 40,000 $ 165,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss 3,200,000 3,200,000  
Financing Receivable, Allowance for Credit Loss, Individually Evaluated 122,000 122,000  
Fair Value, Concentration of Risk, Maximum Amount of Loss [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Commercial and multi-family real estate 326,254,000 $ 326,254,000 339,861,000
Troubled Debt Restructurings [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Minimum period for default   90 days  
Residential Real Estate [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Foreclosed residential real estate properties 40,000,000 $ 40,000,000 165,000,000
One- to four-family [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Loans held for sale $ 353,500,000 $ 353,500,000  
Maximum term of fixed-rate one- to four-family residential mortgage loans   15 years  
Mortgage Loans On Real Estate Number Of Loans | Loans 3    
Purchased Loans and Loan Participations [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Approximate amount of purchase loans included in loans receivable $ 226,000 $ 226,000 198,000
Approximate amount of loans included on out-of-area participation 47,888,000 47,888,000 55,849,000
Amount within 100 miles of primary area $ 44,681,000 $ 44,681,000 $ 38,860,000