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Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]          
Mortgage-backed securities with a book value $ 144,896   $ 144,896   $ 144,905
Fair Value $ 146,807   $ 146,807   146,291
Percentage of equity securities 10.00%   10.00%    
Carrying value of securities pledged as collateral $ 66,434   $ 66,434   57,921
Repurchase agreements 3,340   3,340   2,015
Gross gains from sales of available for sale securities     21,000    
Gross losses from sales of available for sale securities     28,000    
Tax benefit to net realized gains (losses) (2) $ 0 (2) $ 0  
Sales of available-for-sale securities (8)   (7) $ 0  
Investments in debt and marketable equity securities $ 37,552   $ 37,552   $ 47,146
Temporarily impaired debt securities percentage of investment securities portfolio 26.00%   26.00%   32.00%
Maximum [Member]          
Debt Securities, Available-for-sale [Line Items]          
Repurchase agreements term     90 days    
Minimum [Member]          
Debt Securities, Available-for-sale [Line Items]          
Repurchase agreements term     30 days    
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 1,600   1,600    
U.S. Government and Federal Agency and Government Sponsored Enterprises (GSEs) [Member]          
Debt Securities, Available-for-sale [Line Items]          
Mortgage-backed securities with a book value 10,665   10,665   $ 12,654
Fair Value 11,070   11,070   12,950
Mortgage-backed Securities - GSE Residential [Member]          
Debt Securities, Available-for-sale [Line Items]          
Mortgage-backed securities with a book value 128,984   128,984   124,615
Fair Value 130,387   130,387   125,510
Investments in debt and marketable equity securities 33,744   33,744   46,216
Debt Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Investments in debt and marketable equity securities $ 37,552   $ 37,552   $ 47,146