Securities Available for Sale - Schedule Of Available For Sale Securities Pledged (Detail) - Securities Available for Sale [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities pledged	$ 99,423	$ 104,650
FHLB of New York [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities pledged	39,057	42,591
Secure Public Funds On Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities pledged	5,539	6,226
Federal Reserve ("FRB") [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities pledged	43,080	43,049
Depositor Sweep Accounts [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities pledged	$ 11,747	$ 12,784