EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Details) - Pension plan - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Net periodic pension cost included in the Bank's consolidated statements of income
Service cost	$ 589	$ 647	$ 1,235	$ 1,534
Interest cost	$ 1,139	$ 920	$ 2,033	$ 1,885
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense
Expected return on plan assets	$ (1,668)	$ (1,313)	$ (2,862)	$ (2,694)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense
Amortization of net actuarial gain	$ (141)
Net periodic post-retirement benefit cost	(81)	$ 254	$ 406	$ 725
Amounts recognized in accumulated other comprehensive (gain) loss, before tax effect
Amounts recognized in accumulated other comprehensive loss, before tax, net actuarial gain (losses)	$ 10,100		$ 9,900	$ 5,200