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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0 $ 423
Interest cost 628 837
Expected return on assets (1,437) (1,668)
Net loss amortization 520 533
Prior service (credit) cost amortization 0 (3)
Net periodic benefit cost (income) (289) 122
Defined Benefit Pension Plan Acquired    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 24 41
Expected return on assets (58) (84)
Net loss amortization 3 2
Prior service (credit) cost amortization 0 0
Net periodic benefit cost (income) (31) (41)
Restoration Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 85
Interest cost 121 160
Expected return on assets 0 0
Net loss amortization 118 193
Prior service (credit) cost amortization 0 2
Net periodic benefit cost (income) $ 239 $ 440