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v3.22.2.2

Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2022
Pension [Member] |
Components of Net Periodic Pension Plan Cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended | ​ | Three Months Ended
Pension Plan | ​ | September 30, | ​ | September 30,
(in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | ​ | $ | 42 | ​ | $ | 117 | ​ | $ | 14 | ​ | $ | 39
Interest cost | ​ | ​ | 1,152 | ​ | ​ | 1,066 | ​ | ​ | 384 | ​ | ​ | 355
Expected return on assets | ​ | ​ | (2,858) | ​ | ​ | (2,677) | ​ | ​ | (953) | ​ | ​ | (892)
Amortization of net actuarial loss | ​ | ​ | 837 | ​ | ​ | 1,116 | ​ | ​ | 279 | ​ | ​ | 372
Net pension credit included in employee benefits and other expense | ​ | $ | (827) | ​ | $ | (378) | ​ | $ | (276) | ​ | $ | (126)
SERP [Member] |
Components of Net Periodic Pension Plan Cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended | ​ | Three Months Ended
Defined Benefit SERP | ​ | September 30, | ​ | September 30,
(in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | ​ | $ | 124 | ​ | $ | 104 | ​ | $ | 41 | ​ | $ | 35
Interest cost | ​ | ​ | 215 | ​ | ​ | 179 | ​ | ​ | 72 | ​ | ​ | 60
Amortization of recognized loss | ​ | ​ | 203 | ​ | ​ | 226 | ​ | ​ | 68 | ​ | ​ | 75
Amortization of prior service cost | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | — | ​ | ​ | —
Net Defined Benefit SERP expense included in employee benefits and other expense | ​ | $ | 542 | ​ | $ | 508 | ​ | $ | 181 | ​ | $ | 170

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