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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Loss    
Net unrealized gain (loss) on investment securities available-for-sale $ 1,835 $ (3,251)
Income tax 385  
Income tax   (683)
Net of income taxes 1,450  
Net of income taxes   (2,568)
Benefit plan adjustments (6,579) (7,218)
Income tax (1,382) (1,516)
Net of income taxes (5,197) (5,702)
Income tax 144  
Net of income taxes 543  
Derivative adjustments   246
Income tax   52
Net of income taxes   194
Accumulated other comprehensive loss $ (3,205) $ (8,076)