Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Cost Components of Supplemental Executive Retirement Plan (Details)

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Employee Benefit Plans - Cost Components of Supplemental Executive Retirement Plan (Details) - SERP - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1,731 $ 1,933
Interest cost 575 470
Net pension expense (benefit) $ 2,306 $ 2,403