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Loans and Allowance for Credit Losses - Additional Information (Detail)
 6 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
SecurityLoan
Jun. 30, 2023
USD ($)
SecurityLoan
Loans and Allowance for Credit Losses [Line Items]    
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 $ 7,000 $ 31,000
Fair Value, Concentration of Risk, Collateral Policy [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Commercial and multi-family real estate $ 369,596,000 328,721,000
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 $ 0  
One- to four-family [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Loans held for sale $ 689,000 0
Maximum term of fixed-rate one- to four-family residential mortgage loans 15 years  
Purchased Loans and Loan Participations [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Approximate amount of purchase loans included in loans receivable $ 605,000 652,000
Approximate amount of loans included on out-of-area participation 47,075,000 46,073,000
Amount within 100 miles of primary area $ 30,338,000 $ 28,951,000