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RETIREMENT AND POSTRETIREMENT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2021
RETIREMENT AND POSTRETIREMENT PLANS |
Net Periodic Costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | BNB Bank | ​ | ​ | Employee Retirement
​ | ​ | ​ | Pension Plan | ​ | ​ | Plan
​ | ​ | ​ | Three Months Ended March 31,
(In thousands) | ​ | ​ | 2021 | ​ | ​ | 2020
Service cost | ​ | ​ | $ | 148 | ​ | ​ | $ | —
Interest cost | ​ | ​ | ​ | 249 | ​ | ​ | ​ | 183
Expected return on assets | ​ | ​ |  | (984) | ​ | ​ |  | (428)
Amortization of unrealized loss | ​ | ​ |  | 206 | ​ | ​ |  | 229
Net periodic benefit credit | ​ | ​ | $ | (381) | ​ | ​ | $ | (16)

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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