Employee Benefit Plans Employee Benefit Plans 13 (Details) - SERP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Benefit Obligation:
Projected benefit obligation at beginning of year	$ 24,517	$ 24,062
Service cost	1,193	1,096	$ 930
Interest cost	1,069	888	893
Actuarial (gain) loss	3,419	(1,104)
Benefits/expenses paid	(495)	(425)
Projected benefit obligation at end of year	29,703	24,517	$ 24,062
Changes in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
Funded Status:
Net amount recognized as accrued pension cost	$ (29,703)	$ (24,517)