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Employee Benefit Plans 13 (Details) - SERP - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in Benefit Obligation:      
Projected benefit obligation at beginning of year $ 29,703 $ 24,517  
Service cost 1,029 1,193 $ 1,096
Interest cost 988 1,069 888
Actuarial (gain) loss 5,479 3,419  
Benefits/expenses paid (597) (495)  
Projected benefit obligation at end of year 36,602 29,703 $ 24,517
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 $ (36,602) $ (29,703)