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Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]      
Mortgage-backed securities with a book value $ 197,699   $ 186,589
Fair Value $ 199,809   189,891
Percentage of equity securities 10.00%    
Carrying value of securities pledged as collateral $ 96,131   96,429
Repurchase agreements 6,703   6,245
Gross gains from sales of available for sale securities 0 $ 204  
Gross losses from sales of available for sale securities 0 0  
Tax benefit to net realized gains (losses) 0 $ 58  
Investments in debt and marketable equity securities $ 90,661   $ 85,118
Temporarily impaired debt securities percentage of investment securities portfolio 45.00%   45.00%
Maturity Overnight [Member]      
Debt Securities, Available-for-sale [Line Items]      
Repurchase agreements $ 6,700    
Mortgage-backed Securities - GSE Residential [Member]      
Debt Securities, Available-for-sale [Line Items]      
Mortgage-backed securities with a book value 177,066   $ 167,711
Fair Value 178,762   170,415
Investments in debt and marketable equity securities 84,865   79,162
Debt Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Investments in debt and marketable equity securities 90,661   85,118
Small Business Administration [Member]      
Debt Securities, Available-for-sale [Line Items]      
Mortgage-backed securities with a book value 10,872   9,115
Fair Value 10,810   9,190
Investments in debt and marketable equity securities $ 5,796   $ 5,956