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Employee Benefit Plans 12 (Details) - SERP - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Balance in Rabbi Trust
Balance in Rabbi Trust	$ 25,900
Fair value of assets held in Rabbi Trust	0	$ 0
Rabbi Trust | Fair Value
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	25,912	21,553
Level 1 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	25,912	21,553
Level 2 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	0	0
Level 3 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	0	0
Cash equivalents | Rabbi Trust | Fair Value
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	8	72
Cash equivalents | Level 1 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	8	72
Cash equivalents | Level 2 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	0	0
Cash equivalents | Level 3 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	0	0
Fixed income fund | Rabbi Trust | Fair Value
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	10,201	8,427
Fixed income fund | Level 1 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	10,201	8,427
Fixed income fund | Level 2 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	0	0
Fixed income fund | Level 3 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	0	0
Equity securities | Rabbi Trust | Fair Value
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	15,703	13,054
Equity securities | Level 1 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	15,703	13,054
Equity securities | Level 2 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	0	0
Equity securities | Level 3 | Rabbi Trust
Balance in Rabbi Trust
Fair value of assets held in Rabbi Trust	$ 0	$ 0

X

- Definition

Represents the fair value of plan assets subject to claims of creditors.

+ References

No definition available.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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