Derivative Instruments and Hedging Activities - Fair Values of Derivative Financial Instruments as well as Their Classification on Statement of Financial Condition (Detail) - Derivatives Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Other Assets [Member]
Derivative [Line Items]
Fair Value	$ 3,856	$ 31,881
Other Liabilities [Member]
Derivative [Line Items]
Fair Value	140
Interest Rate Swaps [Member] | Other Assets [Member]
Derivative [Line Items]
Fair Value	3,856	$ 31,881
Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivative [Line Items]
Fair Value	$ 140