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Securities Available for Sale - Additional Information (Detail) - USD ($)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]      
Proceeds from sales of debt securities available for sale $ 254,606,000 $ 83,008,000 $ 0
Available-for-sale securities, gross realized gains   1,300,000  
Available-for-sale securities, gross realized losses 31,000 1,700,000  
Securities Available for Sale [Member] | FHLB of New York [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available for sale securities utilized as collateral 42,600,000 41,800,000  
Securities Available for Sale [Member] | Federal Reserve ("FRB") [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available for sale securities utilized as collateral 43,000,000 41,500,000  
Securities Available for Sale [Member] | Depositor Sweep Accounts [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available for sale securities utilized as collateral 12,800,000 8,200,000  
Securities Available for Sale [Member] | Public Funds [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available for sale securities utilized as collateral $ 6,200,000 $ 0