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Employee Benefit Plans 1 (Details) - Pension Benefits
 12 Months Ended
Dec. 31, 2021
participant
item
Dec. 31, 2020
Employee benefit plans    
Minimum age for eligibility under the Pension Plan | item 21  
Minimum period of service for eligibility under the Pension Plan 5 years  
Normal retirement benefit (as a percent) 2.00%  
Defined benefit plan number of highest consecutive years average earnings used in computing retirement benefit 5 years  
Maximum number of years of credited service considered in determining retirement benefit 40 years  
Number of participants in the Pension Plan | participant 918  
Eligibility for employer matching contributions, period of service 3 years  
Discount rate 2.89% 2.55%
Minimum    
Employee benefit plans    
Percentage of participant's eligible pay contributed to the plan by the employer 3.00%  
Maximum    
Employee benefit plans    
Percentage of participant's eligible pay contributed to the plan by the employer 5.25%