Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Total Stockholders' Equity	$ 955,169	$ 995,470	$ 1,042,944	$ 1,063,812	$ 1,092,341	$ 1,084,177
Net Unrealized (Loss) Gain on Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gain on securities available for sale	(63,988)		10,011
Tax effect	(18,760)		(2,882)
Total Stockholders' Equity	(45,228)		7,129
Fair Value Adjustments on Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gain on securities available for sale	32,566		(312)
Tax effect	(9,557)		94
Total Stockholders' Equity	23,009		(218)
Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gain on securities available for sale	(1,033)		(1,093)
Tax effect	303		326
Total Stockholders' Equity	730		(767)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Total Stockholders' Equity	$ (22,949)	$ 1,574	$ 6,144	$ 1,357	$ 6,453	$ 1,257