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Employee Benefit Plans 15 (Details) - SERP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of Net Periodic Benefits Cost:
Service cost	$ 1,029	$ 1,193	$ 1,096
Interest cost	988	1,069	888
Amortization of prior service cost (credit)	0	0	0
Amortization of actuarial (gain) loss	843	471	1,049
Net periodic pension cost under accounting standards	$ 2,860	$ 2,733	$ 3,033
Weighted-average assumptions used to determine net periodic cost:
Discount rate	3.36%	4.40%	3.72%
Rate of compensation increase	4.00%	4.00%	4.00%

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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