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Securities Available for Sale - Schedule Of Available For Sale Securities Pledged (Detail) - Securities Available for Sale [Member] - USD ($)
$ in Thousands
Mar. 31, 2019
Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities pledged $ 78,953 $ 104,650
FHLB of New York [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities pledged 24,357 42,591
Secure Public Funds On Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities pledged   6,226
Federal Reserve ("FRB") [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities pledged 43,341 43,049
Depositor Sweep Accounts [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities pledged $ 11,255 $ 12,784