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EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Details) - Pension plan - USD ($)
 3 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Net periodic pension cost included in the Bank's consolidated statements of income    
Service cost $ 389,000 $ 444,000
Interest cost $ 553,000 $ 507,000
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 $ (789,000) $ (732,000)
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
Net periodic pension cost $ 153,000 $ 219,000
Other disclosures    
Employer contributions $ 0 $ 0