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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Pension [Member] |
Components of Net Periodic Pension Plan Cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended | ​ | Three Months Ended
Pension Plan | ​ | September 30, | ​ | September 30,
(in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | ​ | $ | 117 | ​ | $ | 169 | ​ | $ | 39 | ​ | $ | 57
Interest cost | ​ | ​ | 1,066 | ​ | ​ | 1,219 | ​ | ​ | 355 | ​ | ​ | 406
Expected return on assets | ​ | ​ | (2,677) | ​ | ​ | (2,661) | ​ | ​ | (892) | ​ | ​ | (887)
Amortization of net actuarial loss | ​ | ​ | 1,116 | ​ | ​ | 1,074 | ​ | ​ | 372 | ​ | ​ | 358
Net pension credit included in employee benefits and other expense | ​ | $ | (378) | ​ | $ | (199) | ​ | $ | (126) | ​ | $ | (66)
SERP [Member] |
Components of Net Periodic Pension Plan Cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended | ​ | Three Months Ended
Defined Benefit SERP | ​ | September 30, | ​ | September 30,
(in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | ​ | $ | 104 | ​ | $ | 93 | ​ | $ | 35 | ​ | $ | 31
Interest cost | ​ | ​ | 179 | ​ | ​ | 201 | ​ | ​ | 60 | ​ | ​ | 67
Amortization of recognized loss | ​ | ​ | 226 | ​ | ​ | 141 | ​ | ​ | 75 | ​ | ​ | 47
Amortization of prior service cost | ​ | ​ | (1) | ​ | ​ | (2) | ​ | ​ | — | ​ | ​ | (1)
Net Defined Benefit SERP expense included in employee benefits and other expense | ​ | $ | 508 | ​ | $ | 433 | ​ | $ | 170 | ​ | $ | 144

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