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Securities - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]    
Mortgage-backed securities with a book value $ 186,589 $ 155,588
Fair Value $ 189,891 162,394
Percentage of equity securities 10.00%  
Carrying value of securities pledged as collateral $ 96,429 66,186
Gross gains from sales of available for sale securities 327 295
Gross losses from sales of available for sale securities 7 28
Tax benefit to net realized gains (losses) 92 76
Investments in debt and marketable equity securities $ 85,118 $ 24,574
Temporarily impaired debt securities percentage of investment securities portfolio 45.00% 16.00%
Mortgage-backed Securities - GSE Residential [Member]    
Debt Securities, Available-for-sale [Line Items]    
Mortgage-backed securities with a book value $ 167,711 $ 143,033
Fair Value 170,415 148,855
Investments in debt and marketable equity securities 79,162 24,513
Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Investments in debt and marketable equity securities 85,118 24,574
Small Business Administration [Member]    
Debt Securities, Available-for-sale [Line Items]    
Mortgage-backed securities with a book value 9,115 3,578
Fair Value 9,190 3,640
Investments in debt and marketable equity securities $ 5,956 $ 61