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Investment Securities - Additional Information (Detail)
3 Months Ended 9 Months Ended
Mar. 31, 2022
USD ($)
Security
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Security
Mar. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Security
Investments Debt And Equity Securities [Abstract]          
Sale of investment securities $ 0 $ 5,000,000.0 $ 0 $ 5,000,000.0  
Net realized gains or losses on investment securities [1]   113,000   113,000  
Disposal of securities held to maturity   1,600,000   1,600,000  
Net realized gains from sale of securities held to maturity   $ 61,000   $ 61,000  
Held to maturity substantial portion of principal outstanding percentage     85.00%    
Carrying amounts of securities pledged 206,300,000   $ 206,300,000   $ 180,100,000
Total investment securities $ 448,081,000   $ 448,081,000   $ 394,971,000
Number of securities in unrealized loss position | Security 275   275    
Fair value of securities in unrealized/unrecognized loss position $ 376,500,000   $ 376,500,000    
Other-than-temporarily impaired securities | Security 0   0   0
[1] Not within the scope of ASC 606.