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New Accounting Pronouncements - Additional Information (Detail) - USD ($)
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Jul. 01, 2022
Jun. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retained Earnings (Accumulated Deficit) $ 43,159,000 $ 43,365,000      
Allowance for loan losses 7,450,000 7,139,000 $ 7,023,000   $ 7,052,000
Off-Balance-Sheet, Credit Loss, Liability $ 129,000 $ 216,000      
Accounting Standards Update 2016-13 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retained Earnings (Accumulated Deficit)       $ 388,000,000  
Allowance for loan losses       47,000,000  
Off-Balance-Sheet, Credit Loss, Liability       $ 496,000,000