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EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net periodic cost (benefit):        
Net periodic (benefit) cost $ (62) $ (100) $ (187) $ (302)
Pension Plan [Member]        
Net periodic cost (benefit):        
Interest cost $ 929 $ 900 $ 2,787 $ 2,702
Defined Benefit Plan Net Periodic Benefit Cost Credit Interest Cost Statement Of Income Or Comprehensive Income Extensible List Other Noninterest Expense Other Noninterest Expense Other Noninterest Expense Other Noninterest Expense
Expected return on plan assets $ (998) $ (1,017) $ (2,994) $ (3,053)
Defined Benefit Plan Net Periodic Benefit Cost Credit Expected Return Loss Statement Of Income Or Comprehensive Income Extensible List Other Noninterest Expense Other Noninterest Expense Other Noninterest Expense Other Noninterest Expense
Net periodic (benefit) cost $ (69) $ (117) $ (207) $ (351)
Postretirement Benefit Plan [Member]        
Net periodic cost (benefit):        
Net periodic (benefit) cost $ 7 $ 17 $ 20 $ 49