Pension and Retirement Plans - Certain Disaggregated Information to Retirement Plans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 45,401	$ 40,522	$ 43,943
Accumulated benefit obligation	45,401	40,522
Fair value of plan assets	50,131	42,648	45,247
Funded status at end of year	4,730	2,126
Supplemental Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	9,622	8,830	$ 9,204
Accumulated benefit obligation	9,207	8,567
Funded status at end of year	$ (9,622)	$ (8,830)