Employee Benefit Plans - Status of Pension Plan and SERP (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plan
Employee benefit plans
Accumulated benefit obligation at end of year	$ 21,367	$ 18,713
Change in projected benefit obligation:
Benefit obligation at beginning of year	18,713	19,314
Service cost	164	141
Interest cost	811	728
Actuarial loss (gain)	2,558	(611)
Benefits paid	(879)	(859)
Benefit obligation at end of year	21,367	18,713
Change in plan assets:
Fair value of plan assets at beginning of year	17,500	15,927
Actual return on plan assets	2,814	(968)
Employer contributions		3,400
Benefits paid	(879)	(859)
Fair value of plan assets at end of year	19,435	17,500
Funded status at end of year	(1,932)	(1,213)
Amounts recognized in accumulated other comprehensive loss:
Net actuarial loss	11,008	10,380
Prior service cost	139	144
Accumulated other comprehensive loss, before tax	11,147	10,524	$ 9,245
Pension Plan | Accounts payable and accrued expenses
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses - liability	(1,932)	(1,213)
Supplemental Employee Retirement Plan (SERP)
Employee benefit plans
Accumulated benefit obligation at end of year	9,702	9,473
Change in projected benefit obligation:
Benefit obligation at beginning of year	9,473	9,242
Service cost	84	97
Interest cost	162	151
Benefits paid	(17)	(17)
Benefit obligation at end of year	9,702	9,473
Change in plan assets:
Employer contributions	17	17
Benefits paid	(17)	(17)
Funded status at end of year	(9,702)	(9,473)
Supplemental Employee Retirement Plan (SERP) | Accounts payable and accrued expenses
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses - liability	$ (9,702)	$ (9,473)