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Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]          
Mortgage-backed securities with a book value $ 161,133   $ 161,133   $ 155,588
Fair Value $ 167,551   $ 167,551   162,394
Percentage of equity securities 10.00%   10.00%    
Carrying value of securities pledged as collateral $ 78,898   $ 78,898   66,186
Repurchase agreements 4,571   4,571   3,738
Gross gains from sales of available for sale securities     204 $ 21  
Gross losses from sales of available for sale securities     0 28  
Tax benefit to net realized gains (losses) 0 $ 2 58 $ 2  
Investments in debt and marketable equity securities $ 23,877   $ 23,877   $ 24,574
Temporarily impaired debt securities percentage of investment securities portfolio 14.00%   14.00%   15.00%
Maturity Overnight [Member]          
Debt Securities, Available-for-sale [Line Items]          
Repurchase agreements $ 2,800   $ 2,800    
Maturity 30 to 90 Days [Member]          
Debt Securities, Available-for-sale [Line Items]          
Repurchase agreements 1,800   1,800    
Mortgage-backed Securities - GSE Residential [Member]          
Debt Securities, Available-for-sale [Line Items]          
Mortgage-backed securities with a book value 148,886   148,886   $ 143,033
Fair Value 154,521   154,521   148,855
Investments in debt and marketable equity securities 23,877   23,877   24,513
Debt Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Investments in debt and marketable equity securities $ 24,150   $ 24,150   $ 24,574