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RETIREMENT AND POSTRETIREMENT PLANS - Net periodic benefit (credit) cost for the Employee Retirement Plan (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
BNB Bank Pension Plan |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | $ 175 | $ 267 | $ 525 | $ 802
Interest cost | $ 330 | $ 195 | $ 990 | $ 585
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other | Other | Other | Other
Expected return on assets | $ (687) | $ (857) | $ (2,062) | $ (2,572)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other | Other | Other | Other
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other | Other | Other | Other
Net periodic credit | $ (182) | $ (395) | $ (547) | $ (1,185)
Employee Retirement Plan |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Interest cost | $ 222 | $ 155 | $ 667 | $ 465
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other | Other | Other | Other
Expected return on assets | $ (382) | $ (490) | $ (1,147) | $ (1,470)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other | Other | Other | Other
Amortization of unrealized loss | $ 147 | $ 63 | $ 442 | $ 188
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other | Other | Other | Other
Net periodic credit | $ (13) | $ (272) | $ (38) | $ (817)
Retirement Plans |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Contributions to the BNB Bank Pension Plan or the Employee Retirement Plan |  |  | $ 0 |

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