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RETIREMENT AND POSTRETIREMENT PLANS (Tables) | 9 Months Ended
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Sep. 30, 2021
RETIREMENT AND POSTRETIREMENT PLANS |
Net Periodic Costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30,
​ | ​ | ​ | 2021 | ​ | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | BMP, Postretirement
​ | ​ | BNB Bank | ​ | Employee | ​ | Employee | ​ | and Outside Director
(In thousands) | ​ | Pension Plan | ​ | Retirement Plan | ​ | Retirement Plan | ​ | Retirement Plans
Service cost | ​ | $ | 223 | ​ | $ | — | ​ | $ | — | ​ | $ | —
Interest cost | ​ | ​ | 302 | ​ | ​ | 183 | ​ | ​ | 10 | ​ | ​ | 241
Expected return on assets | ​ | ​ | (1,244) | ​ | ​ | (428) | ​ | ​ | — | ​ | ​ | (428)
Unrecognized past service liability | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (2) | ​ | ​ | —
Amortization of unrealized loss | ​ | ​ | 207 | ​ | ​ | 229 | ​ | ​ | — | ​ | ​ | 274
Net periodic benefit (credit) cost | ​ | $ | (512) | ​ | $ | (16) | ​ | $ | 8 | ​ | $ | 87
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30,
​ | ​ | 2021 | ​ | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | BMP, Postretirement
​ | ​ | BNB Bank | ​ | Employee | ​ | Employee | ​ | and Outside Director
(In thousands) | ​ | Pension Plan | ​ | Retirement Plan | ​ | Retirement Plan | ​ | Retirement Plans
Service cost | ​ | $ | 594 | ​ | $ | — | ​ | $ | — | ​ | $ | —
Interest cost | ​ | ​ | 854 | ​ | ​ | 549 | ​ | ​ | 30 | ​ | ​ | 723
Expected return on assets | ​ |  | (3,473) | ​ |  | (1,284) | ​ |  | — | ​ |  | (1,284)
Unrecognized past service liability | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (6) | ​ | ​ | —
Amortization of unrealized loss | ​ |  | 619 | ​ |  | 687 | ​ |  | — | ​ |  | 822
Net periodic (credit) cost | ​ | $ | (1,406) | ​ | $ | (48) | ​ | $ | 24 | ​ | $ | 261
​

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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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