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Employee Benefit Plans - SERP Narrative (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Jan. 01, 2014
Sep. 30, 2017
Dec. 31, 2019
USD ($)
payment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]            
Benefit obligation     $ 3,571 $ 2,747 $ 1,187 $ 1,023
President and CEO | SERP            
Defined Benefit Plan Disclosure [Line Items]            
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 | payment     15      
Total estimated future payments     $ 6,600      
Assumptions used calculating benefit obligation, discount rate     4.00%      
Annual vesting percentage 3.00%          
Award vesting rights, percentage   100.00%