Comprehensive (Loss) Income - Schedule of Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Comprehensive Income Net Of Tax [Abstract]
Net unrealized holding gain (loss) on securities available for sale		$ 730	$ (2,844)	$ 1,912	$ 7,313
Amortization of net unrealized holding loss on securities available for sale transferred to held to maturity	[1]				596
Net realized (gain) loss on sale and call of securities available for sale	[2]	(813)	(11)	(436)	2
Fair value adjustments on derivatives		3,606	1,844	5,867	(1,286)
Amortization of actuarial loss		21	5	42	10
Net actuarial gain	[3]				470
Net change in benefit plan accrued expense		21	5	42	480
Other comprehensive income (loss) before taxes		3,544	(1,006)	7,385	7,105
Tax effect		(1,065)	271	(2,189)	(1,989)
Total Other Comprehensive Income (Loss)		$ 2,479	$ (735)	$ 5,196	$ 5,116

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

[2] Represents amounts reclassified out of accumulated other comprehensive income and included in gain on sale of securities on the consolidated statements of income.

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