Comprehensive Income - Schedule of Comprehensive Income (loss) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Comprehensive Income Net Of Tax [Abstract]
Net unrealized (loss) gain on securities available for sale		$ (128,601)	$ (11,704)	$ 22,758
Amortization of net unrealized holding gain (loss) on securities available for sale transferred to held to maturity	[1]			596
Net realized (gain) loss on securities available for sale	[2]	559	(767)	(2,251)
Fair value adjustments on derivatives		40,117	19,106	(23,134)
Amortization of actuarial loss	[3]	80	83	19
Net actuarial gain (loss)		924	236	(348)
Net change in benefit plan accrued expense		1,004	319	(329)
Other comprehensive income (loss) before taxes		(86,921)	6,954	(2,360)
Tax effect		25,050	(2,067)	778
Total Other Comprehensive (Loss) Income		$ (61,871)	$ 4,887	$ (1,582)

[1] Represents amounts reclassified out of accumulated other comprehensive (loss) income and included in interest income on taxable securities.

[2] Represents amounts reclassified out of accumulated other comprehensive (loss) income and included in gain on sale of securities on the Consolidated Statements of Income.

[3] Represents amounts reclassified out of accumulated other comprehensive (loss) income and included in the computation of net periodic pension expense. See Note 13 – Benefit Plans for additional information.