Accumulated Other Comprehensive Income (AOCI) - Components of AOCI (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, included in stockholders' equity	$ (22,367)	$ (28,095)
Tax effect	4,912	6,170
Net of tax amount	488,748	446,058	$ 320,772	$ 283,423
Net unrealized loss on securities available-for-sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, included in stockholders' equity	(22,339)	(28,062)
Net unrealized gain on securities available-for-sale securities for which a portion of impairment has been recognized in income
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, included in stockholders' equity	(1)	(1)
Unrealized gain from defined benefit pension plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, included in stockholders' equity	(27)	(32)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of tax amount	$ (17,455)	$ (21,925)	$ (17,487)	$ 2,882