Employee Benefit Plans (Employee Benefit Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost	$ 717	$ 1,010	$ 675
Interest cost	2,555	3,130	2,806
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	75,321
Fair value of plan assets at end of year	76,940	75,321
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)	9,200
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	101,242	92,052
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	92,052	80,776
Service cost	717	1,010
Interest cost	2,555	3,130
Actuarial loss	10,963	10,561
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(1,933)	(2,299)
Settlement	(3,112)	(1,126)
Projected benefit obligation at end of year	101,242	92,052	80,776
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	75,321	66,307
Actual gain (loss) on plan assets	6,664	12,439
Defined Benefit Plan, Plan Assets, Benefits Paid	(1,933)	(2,299)
Settlement	(3,112)	(1,126)
Fair value of plan assets at end of year	76,940	75,321	$ 66,307
Funded status	$ (24,302)	$ (16,731)