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RETIREMENT AND POSTRETIREMENT PLANS - Funded status of the Employee Retirement Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Employee Retirement Plan |  |  |
Reconciliation of projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | $ 19,021 | $ 24,961 |
Interest cost | 900 | 622 | $ 562
Actuarial (gain) loss | 384 | (5,004) |
Benefit payments | (1,584) | (1,558) |
Projected benefit obligation at end of year | 18,721 | 19,021 | 24,961
Plan assets at fair value (investments in trust funds managed by trustee) |  |  |
Balance at beginning of year | 22,593 | 28,693 |
Return on plan assets | 294 | (4,542) |
Benefit payments | (1,584) | (1,558) |
Balance at end of year | 21,303 | 22,593 | 28,693
Funded status at end of year | 2,582 | 3,572 |
BNB Bank Pension Plan |  |  |
Reconciliation of projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 27,920 | 34,495 |
Service cost | 564 | 807 |
Interest cost | 1,263 | 793 |
Actuarial (gain) loss | (883) | (7,111) |
Curtailment | (446) |  |
Benefit payments | (1,136) | (1,064) |
Projected benefit obligation at end of year | 27,282 | 27,920 | 34,495
Plan assets at fair value (investments in trust funds managed by trustee) |  |  |
Balance at beginning of year | 38,572 | 47,857 |
Return on plan assets | 734 | (8,221) |
Benefit payments | (1,136) | (1,064) |
Balance at end of year | 38,170 | 38,572 | 47,857
Funded status at end of year | $ 10,888 | $ 10,652 |
Retirement Plans | BMP and Outside Director Retirement Plan |  |  |
Reconciliation of projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year |  |  | 9,328
Interest cost |  |  | 12
Actuarial (gain) loss |  |  | (277)
Benefit payments |  |  | (9,063)
Plan assets at fair value (investments in trust funds managed by trustee) |  |  |
Contributions |  |  | 9,063
Benefit payments |  |  | (9,063)
Postretirement Benefit Plan |  |  |
Reconciliation of projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year |  |  | 13
Benefit payments |  |  | (13)
Plan assets at fair value (investments in trust funds managed by trustee) |  |  |
Contributions |  |  | 13
Benefit payments |  |  | $ (13)

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- 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/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(10) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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