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Employee Benefit Plans Employee Benefit Plans 12 (Details) - SERP - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Balance in Rabbi Trust |  |
Balance in Rabbi Trust | $ 21,600 |
Fair value of assets held in Rabbi Trust | 0 | $ 0
Rabbi Trust | Level 1 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 21,553 | 16,412
Rabbi Trust | Level 2 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Level 3 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Cash equivalents | Level 1 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 72 | 166
Rabbi Trust | Cash equivalents | Level 2 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Cash equivalents | Level 3 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Fixed income fund | Level 1 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 8,427 | 6,251
Rabbi Trust | Fixed income fund | Level 2 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Fixed income fund | Level 3 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Equity securities | Level 1 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 13,054 | 9,995
Rabbi Trust | Equity securities | Level 2 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Rabbi Trust | Equity securities | Level 3 |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 0 | 0
Fair Value | Rabbi Trust |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 21,553 | 16,412
Fair Value | Rabbi Trust | Cash equivalents |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 72 | 166
Fair Value | Rabbi Trust | Fixed income fund |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | 8,427 | 6,251
Fair Value | Rabbi Trust | Equity securities |  |
Balance in Rabbi Trust |  |
Fair value of assets held in Rabbi Trust | $ 13,054 | $ 9,995

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