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Employee Benefit Plans 13 (Details) - SERP - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in Benefit Obligation:      
Projected benefit obligation at beginning of year $ 36,602 $ 29,703  
Service cost 1,392 1,029 $ 1,193
Interest cost 915 988 1,069
Actuarial (gain) loss (2,213) 5,479  
Benefits paid (607) (597)  
Projected benefit obligation at end of year 36,089 36,602 $ 29,703
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 0    
Fair value of plan assets at end of year 0 0  
Funded Status:      
Net amount recognized as accrued pension cost $ (36,089) $ (36,602)