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Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]            
Mortgage-backed securities with a book value $ 148,711   $ 148,711     $ 144,905
Fair Value $ 152,948   $ 152,948     146,291
Percentage of equity securities 10.00%   10.00%      
Carrying value of securities pledged as collateral $ 70,893   $ 70,893     57,921
Repurchase agreements 3,404   3,404     2,015
Gross gains from sales of available for sale securities     167      
Gross losses from sales of available for sale securities     28      
Tax benefit to net realized gains (losses) $ 42 $ 0 $ 40 $ 0    
Investments in debt and marketable equity securities         $ 9,408 $ 47,146
Temporarily impaired debt securities percentage of investment securities portfolio 6.00%   6.00%     32.00%
Maturity Overnight [Member]            
Debt Securities, Available-for-sale [Line Items]            
Repurchase agreements $ 1,700   $ 1,700      
Maturity 30 to 90 Days [Member]            
Debt Securities, Available-for-sale [Line Items]            
Repurchase agreements 1,700   1,700      
Mortgage-backed Securities - GSE Residential [Member]            
Debt Securities, Available-for-sale [Line Items]            
Mortgage-backed securities with a book value 136,111   136,111     $ 124,615
Fair Value 139,640   139,640     125,510
Investments in debt and marketable equity securities         $ 7,336 46,216
Debt Securities [Member]            
Debt Securities, Available-for-sale [Line Items]            
Investments in debt and marketable equity securities $ 9,408   $ 9,408     $ 47,146