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	Dec. 31, 2020	Jun. 30, 2020
Other Assets [Member]
Derivative [Line Items]
Fair Value	$ 216	$ 235
Other Liabilities [Member]
Derivative [Line Items]
Fair Value	12,293	18,177
Interest Rate Contract [Member] | Other Assets [Member]
Derivative [Line Items]
Fair Value	216	235
Interest Rate Contract [Member] | Other Liabilities [Member]
Derivative [Line Items]
Fair Value	$ 12,293	$ 18,177