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Retirement Plans - Components Of Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of net periodic pension cost and other amounts recognized in other comprehensive income      
Net periodic pension expense   $ (309) $ (351)
Other Comprehensive Income      
Components of net periodic pension cost and other amounts recognized in other comprehensive income      
Interest cost $ 1,157 1,079 1,124
Service cost 121 78 127
Expected return on plan assets (2,361) (2,328) (2,213)
Recognized net actuarial loss 483 775 751
Net periodic pension expense (600) (396) (211)
Plan termination settlements 10,126    
Net periodic pension cost with settlement 9,526 (396)  
Net (gain) loss 2,722 (581) 491
Amortization of gain (loss) (483) (775) (751)
Plan termination settlement adjustment (10,126)    
Total amount recognized in other comprehensive income (7,887) (1,356) (260)
Total recognized in net periodic benefit cost and other comprehensive income $ 1,639 $ (1,752) $ (471)