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EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Details) - Pension plan - USD ($)
 3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Net periodic pension cost included in the Bank's consolidated statements of income        
Service cost $ 258,000 $ 323,000 $ 647,000 $ 767,000
Interest cost $ 367,000 $ 436,000 $ 920,000 $ 943,000
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 Labor and Related Expense Labor and Related Expense
Expected return on plan assets $ (523,000) $ (615,000) $ (1,313,000) $ (1,347,000)
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 Labor and Related Expense Labor and Related Expense
Net periodic post-retirement benefit cost $ 102,000 $ 144,000 $ 254,000 $ 363,000
Other disclosures        
Employer contributions $ 0 $ 0 $ 0 $ 0