Employee Benefit Plans - Executive Incentive Retirement Plan (Details) - Executive Management - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation arrangement, option to elect to defer fees and bonuses, percentage	100.00%
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation arrangement, option to elect to defer fees and bonuses, percentage	7.50%
Deferred compensation, discretionary contribution percentage of base salary	7.50%
Deferred compensation, maximum percentage per year	15.00%
Other Postretirement Benefits Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Accrued employee benefits	$ 115	$ 88	$ 90