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Securities - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]          
Mortgage-backed securities with a book value $ 113,476,000   $ 113,476,000   $ 117,042,000
Fair Value $ 113,589,000   $ 113,589,000   121,328,000
Percentage of equity securities 10.00%   10.00%    
Carrying value of securities pledged as collateral $ 65,294,000   $ 65,294,000   64,180,000
Repurchase agreements 2,440,000   2,440,000   $ 4,392,000
Gross gains from sales of available for sale securities 0 $ 115,000 117,000 $ 605,000  
Gross losses from sales of available for sale securities 0 0 0 188,000  
Tax benefit to net realized gains (losses) 0 $ 46,000 46,000 $ 168,000  
Investments in debt and marketable equity securities $ 46,942,000   $ 46,942,000    
Temporarily impaired debt securities percentage of investment securities portfolio 41.30%   41.30%   0.00%
Maturity Overnight [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Repurchase agreements $ 805,000   $ 805,000    
Monthly Maturity [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Repurchase agreements 1,600,000   1,600,000    
US Government and Federal Agency [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Mortgage-backed securities with a book value 74,828,000   74,828,000   $ 87,193,000
Fair Value 75,190,000   75,190,000   90,105,000
Investments in debt and marketable equity securities 23,616,000   23,616,000    
Mortgage-backed Securities - GSE Residential [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Mortgage-backed securities with a book value 35,373,000   35,373,000   26,418,000
Fair Value 34,866,000   34,866,000   27,245,000
Investments in debt and marketable equity securities 23,326,000   23,326,000    
Debt Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investments in debt and marketable equity securities $ 46,942,000   $ 46,942,000   $ 0