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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Pension [Member] |
Components of Net Periodic Pension Plan Cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended | ​ | Three Months Ended
Pension Plan | ​ | June 30, | ​ | June 30,
(in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | ​ | $ | 78 | ​ | $ | 112 | ​ | $ | 39 | ​ | $ | 56
Interest cost | ​ | ​ | 711 | ​ | ​ | 813 | ​ | ​ | 355 | ​ | ​ | 406
Expected return on assets | ​ | ​ | (1,785) | ​ | ​ | (1,774) | ​ | ​ | (892) | ​ | ​ | (887)
Amortization of net actuarial loss | ​ | ​ | 744 | ​ | ​ | 716 | ​ | ​ | 372 | ​ | ​ | 358
Net pension credit included in employee benefits and other expense | ​ | $ | (252) | ​ | $ | (133) | ​ | $ | (126) | ​ | $ | (67)
SERP [Member] |
Components of Net Periodic Pension Plan Cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended | ​ | Three Months Ended
Defined Benefit SERP | ​ | June 30, | ​ | June 30,
(in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | ​ | $ | 69 | ​ | $ | 62 | ​ | $ | 34 | ​ | $ | 31
Interest cost | ​ | ​ | 119 | ​ | ​ | 134 | ​ | ​ | 59 | ​ | ​ | 67
Amortization of recognized loss | ​ | ​ | 151 | ​ | ​ | 94 | ​ | ​ | 76 | ​ | ​ | 47
Amortization of prior service cost | ​ | ​ | (1) | ​ | ​ | (1) | ​ | ​ | — | ​ | ​ | —
Net Defined Benefit SERP expense included in employee benefits and other expense | ​ | $ | 338 | ​ | $ | 289 | ​ | $ | 169 | ​ | $ | 145

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