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RETIREMENT AND POSTRETIREMENT PLANS - Weighted average allocation by asset category (Details) | Dec. 31, 2022 | Dec. 31, 2021
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BNB Bank Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual Asset category | 100.00% | 100.00%
BNB Bank Pension Plan | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual Asset category | 51.00% | 60.00%
BNB Bank Pension Plan | Debt securities (bond mutual funds) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual Asset category | 46.00% | 37.00%
BNB Bank Pension Plan | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual Asset category | 3.00% | 3.00%
Employee Retirement Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual Asset category | 100.00% | 100.00%
Employee Retirement Plan | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual Asset category | 51.00% | 54.00%
Employee Retirement Plan | Debt securities (bond mutual funds) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual Asset category | 47.00% | 42.00%
Employee Retirement Plan | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual Asset category | 2.00% | 4.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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