Annual report pursuant to Section 13 and 15(d)

Pension and Other Postretirement Benefits - Plan Changes in Fair Value of Plan Assets and Funded Status (Details)

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Pension and Other Postretirement Benefits - Plan Changes in Fair Value of Plan Assets and Funded Status (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in projected benefits obligation:      
Projected benefit obligation at beginning of year $ 9,717 $ 6,577  
Service cost 3,225 1,835 $ 666
Interest cost 264 210 197
Actuarial loss (1,637) 1,333  
Benefits paid (245) (238)  
Projected benefit obligation at end of year 11,324 9,717 6,577
Change in Pension Plan assets:      
Fair value of Pension Plan assets at beginning of year 7,567 6,615  
Actual return on Pension Plan assets 874 161  
Contributions by employer 2,517 1,029  
Benefits paid (245) (238)  
Fair value of Pension Plan assets at end of year 10,713 7,567 $ 6,615
Funded (unfunded) status at end of year $ (611) $ (2,150)