Accumulated Other Comprehensive Loss (AOCL) - Components of AOCI (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Loss (AOCL)
AOCI, included in stockholders' equity	$ (14,576)	$ (22,366)
Tax effect	3,198	4,911
Net of tax amount	544,692	488,748	$ 446,058	$ 320,772
Net unrealized loss on securities available-for-sale
Accumulated Other Comprehensive Loss (AOCL)
AOCI, included in stockholders' equity	(14,551)	(22,339)
Unrealized loss from defined benefit pension plan
Accumulated Other Comprehensive Loss (AOCL)
AOCI, included in stockholders' equity	(25)	(27)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss (AOCL)
Net of tax amount	$ (11,378)	$ (17,455)	$ (21,925)	$ (17,487)