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EMPLOYEE BENEFIT PLANS (Tables) (Imported) | 12 Months Ended
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Dec. 31, 2020
PENSION AND OTHER POSTRETIREMENT PLANS |
Schedule of Components of Net Periodic Benefit Cost | Net period benefit cost and other amounts recognized in other comprehensive income (loss) include the following:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | SERP Benefits
(dollars in thousands) |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Net pension expense: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Service cost | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Interest cost | ​ |  | 75 | ​ |  | 87 | ​ |  | 93 | ​ |  | 27 | ​ |  | 37 | ​ |  | 34
Expected return on plan assets | ​ |  | (140) | ​ |  | (137) | ​ |  | (138) | ​ |  | (51) | ​ |  | (55) | ​ |  | (61)
Recognized net actuarial loss | ​ |  | 171 | ​ |  | 132 | ​ |  | 193 | ​ |  | 80 | ​ |  | 73 | ​ |  | 73
Settlement cost | ​ |  | 115 | ​ |  | — | ​ |  | 224 | ​ |  | 0 | ​ |  | 0 | ​ |  | 0
Net pension expense | ​ | $ | 221 | ​ | $ | 82 | ​ | $ | 372 | ​ | $ | 56 | ​ | $ | 55 | ​ | $ | 46
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net (gain) loss | ​ | $ | 69 | ​ | $ | 353 | ​ | $ | (296) | ​ | $ | 36 | ​ | $ | 56 | ​ | $ | 27
Amortization of net loss | ​ |  | (171) | ​ |  | (132) | ​ |  | (193) | ​ |  | (80) | ​ |  | (73) | ​ |  | (73)
Total recognized in other comprehensive income (loss) | ​ |  | (102) | ​ |  | 221 | ​ |  | (489) | ​ |  | (44) | ​ |  | (17) | ​ |  | (46)
Total recognized in net pension expense and other comprehensive income (loss) | ​ | $ | 119 | ​ | $ | 303 | ​ | $ | (117) | ​ | $ | 12 | ​ | $ | 38 | ​ | $ | —

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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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