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Employee Benefit Plans - Fair value non-vested restricted shares (Details) - Retirement Income Plan - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation exceeds fair value of the plan assets | $ (8,377,000) | $ (5,053,000) |
Employer contribution | 0 | 5,000,000 |
Accumulated other comprehensive loss, before tax | $ 3,043,000 | $ 1,888,000 | $ (1,650,000)
Expected long-term return assumption | 7.00% | 7.00% | 7.00%

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