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Employee Benefit Plans - SERP Narrative (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
installment
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure        
Benefit obligation $ 3,845 $ 3,845 $ 3,708 $ 3,571
President and CEO | SERP        
Defined Benefit Plan Disclosure        
Percent of average executive base salary 60.00%      
Payment term after separation 36 months      
Percent of average executive base salary, adjustment thereafter 2.00%      
Number of annual payments after separation | installment 15      
Total estimated future payments $ 6,200      
Assumptions used calculating benefit obligation, discount rate 4.00%      
Annual vesting percentage 3.00%      
Award vesting rights, percentage 100.00%