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Employee Benefit Plans 1 (Details) - Pension Benefits
 12 Months Ended
Dec. 31, 2020
participant
item
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 935
Eligibility for employer matching contributions, period of service 3 years
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%