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RETIREMENT AND POSTRETIREMENT PLANS - Net periodic cost for the Employee Retirement Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net Periodic Benefit Cost        
Settlement loss recognized     $ (7,231)  
Employee Retirement Plan        
Net Periodic Benefit Cost        
Interest cost $ 218 $ 210 $ 435 $ 420
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 assets $ (322) $ (360) $ (645) $ (720)
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 unrealized loss $ 232 $ 202 $ 465 $ 405
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 Labor and Related Expense Labor and Related Expense
Net periodic (credit) benefit $ 128 $ 52 $ 255 $ 105
Total benefit cost 128 52 255 105
Pension Plan        
Net Periodic Benefit Cost        
Interest cost   $ 310 $ 271 $ 620
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
Expected return on assets   $ (680) $ (534) $ (1,360)
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
Amortization of unrealized loss     $ 49  
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Labor and Related Expense  
Net periodic (credit) benefit   $ (370) $ (214) $ (740)
Settlement loss recognized     7,231  
Total benefit cost   (370) 7,017 (740)
Supplemental Employee Retirement Plan        
Net Periodic Benefit Cost        
Contributions to the BNB Bank Pension Plan or the Employee Retirement Plan $ 0 $ 0 $ 0 $ 0