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Disclosures About Fair Value of Assets and Liabilities - Estimated Fair Values of Financial Instruments and Level within Fair Value Hierarchy in which Fair Value Measurements Fall (Detail) - USD ($)
Mar. 31, 2023
Jun. 30, 2022
Financial assets    
Cash and cash equivalents $ 9,465,000 $ 75,811,000
Interest-bearing time deposits in banks 1,250,000 1,500,000
Loans, net of allowance for loan losses 578,511,000 518,931,000
Federal Home Loan Bank stock 3,843,000 3,142,000
Accrued interest receivable 2,641,000 2,023,000
Financial liabilities    
Deposits 691,568,000 752,020,000
Repurchase agreements 10,764,000 9,244,000
Federal Home Loan Bank advances 56,500,000 15,000,000
Advances from borrowers for taxes and insurance 1,352,000 503,000
Accrued interest payable 961,000 176,000
Unrecognized financial instruments (net of contract amount)    
Commitments to originate loans 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets    
Cash and cash equivalents 9,465,000 75,811,000
Interest-bearing time deposits in banks 1,250,000 1,500,000
Unrecognized financial instruments (net of contract amount)    
Commitments to originate loans 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Financial assets    
Federal Home Loan Bank stock 3,843,000 3,142,000
Accrued interest receivable 2,641,000 2,023,000
Financial liabilities    
Deposits 404,660,000 501,544,000
Repurchase agreements 10,764,000 9,244,000
Federal Home Loan Bank advances 56,360,000 14,903,000
Advances from borrowers for taxes and insurance 1,352,000 503,000
Accrued interest payable 961,000 176,000
Unrecognized financial instruments (net of contract amount)    
Commitments to originate loans 0 0
Significant Unobservable Inputs (Level 3) [Member]    
Financial assets    
Loans, net of allowance for loan losses 555,882,000 512,643,000
Financial liabilities    
Deposits 284,542,000 250,650,000
Unrecognized financial instruments (net of contract amount)    
Commitments to originate loans $ 0 $ 0