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Employee Benefit Plan (Tables)
 12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Net Funded Status [Table Text Block]
The following table reflects the accumulated benefit obligation and funded status of the SERP:
 
 
December 31,
 
 
2019
 
2018
 
 
(in thousands)
Change in benefit obligation
 
 
 
 
Benefit obligation at beginning of period
 
$
9,991

 
$
8,891

Service cost
 
632

 
614

Interest cost
 
569

 
512

Actuarial losses/(gains)
 
834

 
41

Expected benefits paid
 
(270
)
 
(67
)
Projected benefit obligation at end of year
 
$
11,756

 
$
9,991

Unfunded projected/accumulated benefit obligation
 
(11,756
)
 
(9,991
)
Additional liability
 
$
—

 
$
—

 
 
 
 
 
Weighted average assumptions to determine benefit obligation
 
 
 
 
Discount rate
 
5.25
%
 
5.75
%
Rate of compensation increase
 
3.00
%
 
3.00
%
Schedule of Net Benefit Costs [Table Text Block]
The components of net periodic benefit cost recognized for the year ended December 31, 2019 and 2018 and the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost during 2020 are as follows:
 
 
Year Ended December 31,
 
 
2020
 
2019
 
2018
 
 
(in thousands)
Components of net periodic benefit cost
 
 
 
 
 
 
Service cost
 
$
511

 
$
632

 
$
614

Interest cost
 
612

 
569

 
512

Amortization of prior service cost
 
19

 
64

 
103

Amortization of actuarial (gains)/losses
 
(35
)
 
(159
)
 
(164
)
Net periodic benefit cost
 
$
1,107

 
$
1,106

 
$
1,065

 
 
 
 
 
 
 
Other comprehensive income (cost)
 
$
(16
)
 
$
(95
)
 
$
(61
)