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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2022
Pension [Member] |
Components of Net Periodic Pension Plan Cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended | ​ | Three Months Ended
Pension Plan | ​ | June 30, | ​ | June 30,
(in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | ​ | $ | 28 | ​ | $ | 78 | ​ | $ | 14 | ​ | $ | 39
Interest cost | ​ | ​ | 768 | ​ | ​ | 711 | ​ | ​ | 384 | ​ | ​ | 355
Expected return on assets | ​ | ​ | (1,905) | ​ | ​ | (1,785) | ​ | ​ | (953) | ​ | ​ | (892)
Amortization of net actuarial loss | ​ | ​ | 558 | ​ | ​ | 744 | ​ | ​ | 279 | ​ | ​ | 372
Net pension credit included in employee benefits and other expense | ​ | $ | (551) | ​ | $ | (252) | ​ | $ | (276) | ​ | $ | (126)
SERP [Member] |
Components of Net Periodic Pension Plan Cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended | ​ | Three Months Ended
Defined Benefit SERP | ​ | June 30, | ​ | June 30,
(in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | ​ | $ | 83 | ​ | $ | 69 | ​ | $ | 42 | ​ | $ | 34
Interest cost | ​ | ​ | 143 | ​ | ​ | 119 | ​ | ​ | 71 | ​ | ​ | 59
Amortization of recognized loss | ​ | ​ | 135 | ​ | ​ | 151 | ​ | ​ | 67 | ​ | ​ | 76
Amortization of prior service cost | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | — | ​ | ​ | —
Net Defined Benefit SERP expense included in employee benefits and other expense | ​ | $ | 361 | ​ | $ | 338 | ​ | $ | 180 | ​ | $ | 169

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