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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2022
Pension [Member] |
Components of Net Periodic Pension Plan Cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
Pension Plan | ​ | March 31,
(in thousands) |  | 2022 |  | 2021
Service cost | ​ | $ | 14 | ​ | $ | 39
Interest cost | ​ | ​ | 384 | ​ | ​ | 356
Expected return on assets | ​ | ​ | (952) | ​ | ​ | (893)
Amortization of net actuarial loss | ​ | ​ | 279 | ​ | ​ | 372
Net pension credit included in employee benefits and other expense | ​ | $ | (275) | ​ | $ | (126)
SERP [Member] |
Components of Net Periodic Pension Plan Cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
Defined Benefit SERP | ​ | March 31,
(in thousands) |  | 2022 |  | 2021
Service cost | ​ | $ | 41 | ​ | $ | 35
Interest cost | ​ | ​ | 72 | ​ | ​ | 60
Amortization of recognized loss | ​ | ​ | 68 | ​ | ​ | 75
Amortization of prior service cost | ​ | ​ | — | ​ | ​ | (1)
Net Defined Benefit SERP expense included in employee benefits and other expense | ​ | $ | 181 | ​ | $ | 169

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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