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Investment Securities - Additional Information (Detail)
3 Months Ended 9 Months Ended
Mar. 31, 2020
USD ($)
Security
Mar. 31, 2020
USD ($)
Security
Mar. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Security
Investments Debt And Equity Securities [Abstract]        
Sale of investment securities $ 4,700,000 $ 4,700,000 $ 2,100,000  
Gross realized gains or losses on investment securities [1] 38,000 38,000 $ 55,000  
Disposal of securities held to maturity 426,000 426,000    
Gross realized gains from sale of securities held to maturity $ 17,000 $ 17,000    
Held to maturity substantial portion of principal outstanding percentage 85.00% 85.00%    
Carrying amounts of securities pledged $ 185,000,000 $ 185,000,000   $ 166,400,000
Total investment securities $ 309,618,000 $ 309,618,000   $ 417,773,000
Number of securities in unrealized loss position | Security 23 23    
Fair value of securities in unrealized loss position $ 45,400,000 $ 45,400,000    
Other-than-temporarily impaired securities | Security 0 0   0
[1] Not within the scope of ASC 606