EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Details) - Pension plan - USD ($)	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Net periodic pension cost included in the Bank's consolidated statements of income
Service cost	$ 444,000	$ 764,000
Interest cost	$ 507,000	$ 514,000
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
Expected return on plan assets	$ (732,000)	$ (1,031,000)
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
Amortization of net actuarial loss		$ 5,000
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Labor and Related Expense	Labor and Related Expense
Net periodic pension cost	$ 219,000	$ 252,000
Other disclosures
Employer contributions	$ 0	$ 0