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RETIREMENT AND POSTRETIREMENT PLANS - Funded status of the Employee Retirement Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
BNB Bank Pension Plan |  |  |
Reconciliation of projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | $ 34,495 |  |
Acquired in the Merger |  | $ 33,897 |
Service cost | 807 | 893 |
Interest cost | 793 | 609 |
Actuarial (gain) loss | (7,111) | (304) |
Benefit payments | (1,064) | (600) |
Projected benefit obligation at end of year | 27,920 | 34,495 |
Plan assets at fair value (investments in trust funds managed by trustee) |  |  |
Balance at beginning of year | 47,857 |  |
Acquired in the Merger |  | 43,685 |
Return on plan assets | (8,221) | 4,772 |
Benefit payments | (1,064) | (600) |
Balance at end of year | 38,572 | 47,857 |
Funded status at end of year | 10,652 | 13,362 |
Employee Retirement Plan |  |  |
Reconciliation of projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 24,961 | 26,891 |
Interest cost | 622 | 562 | $ 732
Actuarial (gain) loss | (5,004) | (903) |
Benefit payments | (1,558) | (1,589) |
Projected benefit obligation at end of year | 19,021 | 24,961 | 26,891
Plan assets at fair value (investments in trust funds managed by trustee) |  |  |
Balance at beginning of year | 28,693 | 27,142 |
Return on plan assets | (4,542) | 3,140 |
Benefit payments | (1,558) | (1,589) |
Balance at end of year | 22,593 | 28,693 | 27,142
Funded status at end of year | 3,572 | 3,732 |
RETIREMENT PLANS | BMP and Outside Director Retirement Plan |  |  |
Reconciliation of projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year |  | 9,328 | 9,360
Interest cost |  | 12 | 234
Actuarial (gain) loss |  | (277) | 505
Benefit payments |  | (9,063) | (771)
Projected benefit obligation at end of year |  |  | 9,328
Plan assets at fair value (investments in trust funds managed by trustee) |  |  |
Contributions |  | 9,063 | 771
Benefit payments |  | (9,063) | (771)
Funded status at end of year |  |  | (9,328)
POSTRETIREMENT PLANS |  |  |
Reconciliation of projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year |  | 13 | 1,608
Interest cost |  |  | 42
Actuarial (gain) loss |  |  | 105
Curtailment gain | $ (1,600) |  | (1,577)
Benefit payments |  | (13) | (165)
Projected benefit obligation at end of year |  |  | 13
Plan assets at fair value (investments in trust funds managed by trustee) |  |  |
Contributions |  | 13 | 165
Benefit payments |  | $ (13) | (165)
Funded status at end of year |  |  | $ (13)

X
- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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