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Employee Benefit Plans 12 (Details) - SERP - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Employee benefit plans
Fair value of assets held in Rabbi Trust	$ 0	$ 0
Rabbi Trust | Fair Value
Employee benefit plans
Fair value of assets held in Rabbi Trust	31,468	25,912
Level 1 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	31,468	25,912
Level 2 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Level 3 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Cash equivalents | Rabbi Trust | Fair Value
Employee benefit plans
Fair value of assets held in Rabbi Trust	8	8
Cash equivalents | Level 1 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	8	8
Cash equivalents | Level 2 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Cash equivalents | Level 3 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Fixed income securities | Rabbi Trust | Fair Value
Employee benefit plans
Fair value of assets held in Rabbi Trust	12,442	10,201
Fixed income securities | Level 1 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	12,442	10,201
Fixed income securities | Level 2 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Fixed income securities | Level 3 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Equity securities | Rabbi Trust | Fair Value
Employee benefit plans
Fair value of assets held in Rabbi Trust	19,018	15,703
Equity securities | Level 1 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	19,018	15,703
Equity securities | Level 2 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	0	0
Equity securities | Level 3 | Rabbi Trust
Employee benefit plans
Fair value of assets held in Rabbi Trust	$ 0	$ 0

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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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