Pension Plans - Qualified Plan - Change in Plan Assets (Details) - Pension Plan [Member] - Qualified Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 59,653	$ 69,245
Actual return on plan assets	11,346	(4,937)
Employer contributions	1,479	1,563
Benefits paid	(6,478)	(6,218)
Fair value of plan assets at end of year	66,000	59,653
Funded status and accrued pension cost	$ (16,518)	$ (18,194)