XML 37 R28.htm IDEA: XBRL DOCUMENT
v3.22.1

Employee benefit plans (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2022
Employee benefit plans |
Schedule of components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​
​ | ​ | Pension Benefits
Three Months Ended March 31, |  | 2022 |  | 2021
Components of net periodic pension benefit: |  | ​ | ​ |  | ​ | ​
Interest cost | ​ | $ | 114 | ​ | $ | 105
Expected return on plan assets | ​ |  | (352) | ​ |  | (322)
Amortization of unrecognized net gain | ​ |  | 50 | ​ |  | 76
Net periodic benefit | ​ | $ | (188) | ​ | $ | (141)
​ | ​ | ​

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration